Income Statement [Abstract] NET SALES Sales Revenue, Goods, Net COST OF GOODS SOLD Cost of Goods Sold Gross profit Gross Profit OPERATING EXPENSES: Operating Expenses [Abstract] Engineering, research and development Research and Development Expense Selling, general & administrative Selling, General and Administrative Expense Total operating expenses Operating Expenses Income from operations Operating Income (Loss) OTHER INCOME (LOSS) Investment Income, Nonoperating [Abstract] Investment income Investment Income, Nonoperating Other Loss, net Other Nonoperating Income (Expense) Total Other Income (Loss) Nonoperating Income (Expense) Income before provision for income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest PROVISION FOR INCOME TAXES Income Tax Expense (Benefit) NET INCOME Net Income (Loss) Attributable to Parent EARNINGS PER SHARE: Earnings Per Share [Abstract] Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Cash Dividends Declared per Share (in dollars per share) Common Stock, Dividends, Per Share, Declared Statement of Financial Position [Abstract] ASSETS Assets [Abstract] CURRENT ASSETS Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Short-term investments Short-term Investments Accounts receivable, net Accounts Receivable, Net, Current Inventories Inventory, Net Prepaid expenses and other Prepaid Expense and Other Assets, Current Total current assets Assets, Current PLANT AND EQUIPMENT—NET Property, Plant and Equipment, Net OTHER ASSETS Assets, Noncurrent [Abstract] Goodwill Goodwill Long-term investments Long-term Investments Intangible Assets, net Intangible Assets, Net (Excluding Goodwill) Patents and other assets, net Patents and Other Assets Net Patents and Other Assets Net Total other assets Other Assets, Noncurrent Total assets Assets LIABILITIES AND SHAREHOLDERS’ INVESTMENT Liabilities and Equity [Abstract] CURRENT LIABILITIES Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued liabilities Accrued Liabilities, Current Total current liabilities Liabilities, Current LONG TERM DEBT Long-term Debt DEFERRED INCOME TAXES Deferred Tax Liabilities, Net, Noncurrent TOTAL LIABILITIES Liabilities SHAREHOLDERS’ INVESTMENT Stockholders' Equity Attributable to Parent [Abstract] Common stock Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Total shareholders’ investment Stockholders' Equity Attributable to Parent Total liabilities and shareholders’ investment Liabilities and Equity Schedule of Earnings Per Share Basic And Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Earnings Per Share Earnings Per Share [Text Block] New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Adoption of New Accounting Standards New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Equity Incentive Plans [Member] Stock Compensation Plan [Member] Stock Options [Member] Employee Stock Option [Member] Employee Stock Ownership Plan (ESOP) Disclosures, by Plan [Axis] Employee Stock Ownership Plan (ESOP) Name [Axis] Employee Stock Ownership Plan (ESOP), Plan [Domain] Employee Stock Ownership Plan (ESOP), Plan [Domain] Employee Stock Option Plan [Member] Employee Stock Option Plan [Member] Employee Stock Option Plan [Member] Non-Employee Director Stock Option Plan [Member] Non Employee Director Stock Option Plan [Member] Non-Employee Director Stock Option Plan [Member] Employee Stock Purchase Plan [Member] Employee Stock Purchase Plan [Member] Employee Stock Purchase Plan [Member] Restricted Stock Plan [Member] Restricted Stock Plan [Member] Restricted Stock Plan [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of plans (in plans) Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans Compensation expense for share-based payments Allocated Share-based Compensation Expense Compensation cost capitalized as part of inventory Share-based Goods and Nonemployee Services Transaction, Capitalized Cost Number of shares available for grant (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Option vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Option expiration period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Number of shares authorized (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Unrecognized compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Options granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Shares approved (in shares) Employee Stock Ownership Plan (ESOP), Shares in ESOP ESPP discount rate Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date Shares granted (in shares) Employee Stock Ownership Plan (ESOP), Number of Allocated Shares ESPP discount rate recognized as compensation expense Share Based Compensation Arrangement By Share Based Payment Award Discount Recognized As Compensation Expense Share-based compensation arrangement by share-based payment award discount recognized as compensation expense. Restricted period, maximum, in years Share-Based Compensation, Restricted Period Share-based compensation, restricted period. Unearned stock-based compensation Deferred Compensation Equity Amortization expense Restricted Stock or Unit Expense Equity [Abstract] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Amounts Reclassified from Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Unrealized gains on available-for-sale securities: Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Unrealized gains (losses) on derivatives Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Reclassification Out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Realized gain (loss) on sale of securities Gain (Loss) on Investments, Excluding Other than Temporary Impairments Provision for Income Taxes Total reclassifications for the period Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Investments [Abstract] Investment Securities Stated at Fair Value Fair Value, Assets Measured on Recurring Basis [Table Text Block] Schedule of Amortized Cost, Unrealized Gains And Losses, And Market Value of Investment Securities Unrealized Gain (Loss) on Investments [Table Text Block] Schedule of Unrealized Loss on Investments Schedule of Unrealized Loss on Investments [Table Text Block] Investments Classified by Contractual Maturity Date Investments Classified by Contractual Maturity Date [Table Text Block] Debt Disclosure [Abstract] Debt and Financing Arrangements Debt Disclosure [Text Block] Investments, Debt and Equity Securities [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Fixed Income Securities [Member] Fixed Income Securities [Member] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Due within one year Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Due between one and five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value Due over five years Available-for-sale Securities, Debt Maturities, after Five Years, Fair Value Available-for-sale Securities, Debt Maturities, after Five Years, Fair Value Total Available-for-sale Securities, Debt Securities Equity Stockholders' Equity Note Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Contingencies Commitments and Contingencies Disclosure [Text Block] Comprehensive Income Comprehensive Income (Loss) Note [Text Block] Inventory Disclosure [Abstract] Raw materials Inventory, Raw Materials, Gross Work-in-process Inventory, Work in Process, Gross Finished goods Inventory, Finished Goods, Gross Total Inventory Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Intangible Assets Schedule of Intangible Assets and Goodwill [Table Text Block] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Foreign currency translation adjustments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Accumulated other comprehensive income (loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Balance at beginning of period Other Comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Amounts reclassified from accumulated other comprehensive income Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Comprehensive Income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Balance at end of period Accumulated other comprehensive income (loss), end of period AOCI Tax, Attributable to Parent Numerators [Abstract] Numerators [Abstract] Numerators [Abstract] Numerator for both basic and diluted EPS, net income Denominators [Abstract] Denominators [Abstract] Denominators [Abstract] Denominator for basic EPS, weighted-average shares outstanding Weighted Average Number of Shares Outstanding, Basic Potentially dilutive shares resulting from stock plans Weighted Average Number Diluted Shares Outstanding Adjustment Denominator for diluted EPS Weighted Average Number of Shares Outstanding, Diluted Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Statement of Comprehensive Income [Abstract] Net income Other comprehensive income (loss) before tax: Other Comprehensive Income (Loss), before Tax [Abstract] Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Unrealized gains (losses) on derivatives Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax Unrealized gains (losses) on available-for sales securities, net Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax Other comprehensive income (loss), before tax Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Expense (Benefit) for income taxes related to components of other comprehensive income (loss) Other Comprehensive Income (Loss), Tax Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2016-09 [Member] Accounting Standards Update 2016-09 [Member] Accounting Standards Update 2016-09 [Member] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Recognized a discrete tax benefit Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount Tax benefit recognized as additional paid-in capital Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net Tax benefit recognized as additional paid-in capital, gross Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation Tax benefit recognized as additional paid-in capital, tax Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation Reclassified tax benefits to operating activities Net Cash Provided by (Used in) Financing Activities Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities Segment Reporting [Abstract] Schedule of Automotive and Other Segment Reporting Schedule of Segment Reporting Information, by Segment [Table Text Block] Inventories Inventory Disclosure [Text Block] Document And Entity Information [Abstract] Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Trading Symbol Trading Symbol Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Segment Reporting Segment Reporting Disclosure [Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Automotive Products Automotive Products Segment [Member] Automotive Products Segment [Member] Other Other Segments [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Revenue Income from operations Statement of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Gain on disposal of assets Gain (Loss) on Disposition of Other Assets Loss on disposal of assets Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Gain on sale of investments Gain on Sale of Investments Loss on sale of investments Gain (Loss) on Sale of Investments Deferred income taxes Deferred Income Tax Expense (Benefit) Stock-based compensation expense related to employee stock options, employee stock purchases and restricted stock Share-based Compensation Change in operating assets and liabilities: Increase (Decrease) in Operating Assets [Abstract] Accounts receivable, net Increase (Decrease) in Accounts Receivable Inventories Increase (Decrease) in Inventories Prepaid expenses and other Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued liabilities, excluding dividends declared and short-term debt Increase (Decrease) in Accrued Liabilities Net cash provided by operating activities CASH FLOWS USED FOR INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Activity in available-for-sale securities: Payments to Acquire Available-for-sale Securities [Abstract] Sales proceeds Proceeds from Sale of Available-for-sale Securities Maturities and calls Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities Purchases Payments to Acquire Available-for-sale Securities Plant and equipment additions Payments to Acquire Productive Assets Proceeds from sale of plant and equipment Proceeds from Sale of Property, Plant, and Equipment (Increase) Decrease in other assets Increase (Decrease) in Other Operating Assets Net cash used for investing activities Net Cash Provided by (Used in) Investing Activities CASH FLOWS USED FOR FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Repayment of long-term debt Proceeds from (Repayments of) Long-term Debt and Capital Securities Issuance of common stock from stock plan transactions Proceeds from Issuance of Common Stock Cash dividends paid Payments of Ordinary Dividends, Common Stock Repurchases of common stock Payments for Repurchase of Common Stock Net cash used for financing activities NET INCREASE IN CASH AND CASH EQUIVALENTS Cash and Cash Equivalents, Period Increase (Decrease) CASH AND CASH EQUIVALENTS, beginning of period CASH AND CASH EQUIVALENTS, end of period Schedule of notional amount of the Company's derivative instruments Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Schedule of financial assets and liabilities measured at fair value in the consolidated balance sheets Fair Value, by Balance Sheet Grouping [Table Text Block] Schedule of net changes in the Company's accumulated other comprehensive income by component Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Schedule of reclassifications out of other comprehensive income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Credit Agreement [Member] Line of Credit [Member] Revolving Facility [Member] Revolving Credit Facility [Member] Term Loan [Member] Term Loan [Member] Term Loan [Member] Swing Loans [Member] Swing Loans [Member] Swing Loans [Member] Letters of Credit [Member] Letter of Credit [Member] Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Extinguishment of Debt [Axis] Extinguishment of Debt [Axis] Extinguishment of Debt, Type [Domain] Extinguishment of Debt, Type [Domain] Term Loan and Revolving Facility [Member] Term Loan and Revolving Facility [Member] Term Loan and Revolving Facility [Member] Revolving Facility [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR Rate [Member] London Interbank Offered Rate (LIBOR) [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Other, Net [Member] Other, Net [Member] Other, Net [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest Rate Swap [Member] Interest Rate Swap [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Principal amount Debt Instrument, Face Amount Additional principal amount available Debt Instrument, Additional Borrowings Available Face Amount Debt Instrument, Additional Borrowings Available Face Amount Partial repayment of debt Extinguishment of Debt, Amount Short-term debt Short-term Debt Long-term debt Available borrowing capacity Debt Instrument, Unused Borrowing Capacity, Amount Annual principal repayments Debt Instrument, Annual Principal Payment Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Payments of financing costs Payments of Financing Costs Amount of hedged item Derivative, Amount of Hedged Item Notional amount of derivative Derivative Liability, Notional Amount Fixed interest rate of derivative Derivative, Fixed Interest Rate Interest expense Interest Expense, Debt Financial assets: Assets, Fair Value Disclosure [Abstract] Interest Rate Swap Asset Derivative Asset Financial Liabilities: Financial Liabilities Fair Value Disclosure [Abstract] Interest Rate Swap Liability (Other Accrued Liabilities) Derivative Liability Effect of 1% in increase on borrowing rate (less than) Effect of One Percentage Point Increase on Borrowing Rate to Interest Expense Effect of One Percentage Point Increase on Borrowing Rate to Interest Expense Aggregate Unrealized Losses, Less than one year Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Aggregate Fair Value, Less than one year Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Aggregate Unrealized Losses, Greater than one year Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Aggregate Fair Value, Greater than one year Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Aggregate Unrealized Losses, Total Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Aggregate Fair Value, Total Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Equity investment losses were considered to be other than temporary Other than Temporary Impairment Losses, Investments Adoption of new Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Investment [Table] Investment [Table] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Summary of Investments, Other than Investments in Related Parties, by Type [Axis] Investment Type [Axis] Summary of Investments, by Type [Domain] Investments [Domain] Short-term Investments [Member] Short-term Investments [Member] Long-Term Investments [Member] Other Long-term Investments [Member] Certificates of Deposit [Member] Certificates of Deposit [Member] Government Securities [Member] US Treasury Securities [Member] Mutual Funds [Member] Mutual Fund [Member] Corporate Bond Securities [Member] Corporate Bond Securities [Member] Other Debt Obligations [Member] Other Debt Obligations [Member] Common Stocks [Member] Common Stock [Member] Mutual Funds – Equity [Member] Equity Funds [Member] Preferred Stock [Member] Preferred Stock [Member] Cash & Cash Equivalents Cash and Cash Equivalents, Fair Value Disclosure Cost Available-for-sale Securities, Amortized Cost Basis Unrealized Gains Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Unrealized Losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Market Value Investments, Fair Value Disclosure Investments and Cash Investments and Cash Income Tax Disclosure [Abstract] Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Favorable discrete items Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount Change in tax method Effective Income Tax Rate Reconciliation, Change in Tax Method, Amount Effective Income Tax Rate Reconciliation, Change in Tax Method, Amount Common stock issued under stock compensation plan (in shares) Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Stock repurchased (in shares) Stock Repurchased During Period, Shares Net decrease in period (in shares) Net Decrease in Common Stock Shares from Shares Issued in Share Based Compensation and Shares Repurchased Net Decrease in Common Stock Shares from Shares Issued in Share Based Compensation and Shares Repurchased Increase in quarterly cash dividend rate (in dollars per share) Increase In Cash Dividend Rate Increase In Cash Dividend Rate Dividends declared (in dollars per share) Dividends declared Dividends Investments Fair Value Disclosures [Text Block] Schedule of Inventories Schedule of Inventory, Current [Table Text Block] Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table] Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table] Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] HomeLink® HomeLink® [Member] HomeLink® [Member] Indefinite-lived Intangible Assets by Major Class [Axis] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] HomeLink Trade Names and Trademarks Trademarks and Trade Names [Member] Exclusive Licensing Agreement Licensing Agreements [Member] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Gentex Patents Patents [Member] Homelink Technology Developed Technology Rights [Member] Existing Customer Platforms Customer Contracts [Member] Patents and Other Intangible Assets Patents and Other Intangible Assets [Member] Patents and Other Intangible Assets [Member] Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] [Line Items] for Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table] Indefinite-lived intangible assets Indefinite-Lived Intangible Assets (Excluding Goodwill) Finite-lived intangible assets, gross Finite-Lived Intangible Assets, Gross Finite-lived intangible assets, accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Finite-lived intangible assets, net Finite-Lived Intangible Assets, Net Intangible assets, gross Intangible Assets, Gross (Excluding Goodwill) Intangible assets, net Finite-lived intangible asset, useful life Finite-Lived Intangible Asset, Useful Life Weighted-Average Assumptions For The Employee Stock Option Plan Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Accumulated amortization Amortization expense Amortization of Intangible Assets Amortization expense, 2017 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year Amortization expense, 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Two Amortization expense, 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Three Amortization expense, 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Four Amortization expense, 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Five Income Taxes Income Tax Disclosure [Text Block] Stock-Based Compensation Plans Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected term of options Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Weighted-avg. grant-date fair value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value