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Consolidated Statements of Cash Flows (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net Income | $ 288,604,579 us-gaap_NetIncomeLoss | $ 222,929,949 us-gaap_NetIncomeLoss | $ 168,586,840 us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 77,376,305 us-gaap_DepreciationDepletionAndAmortization | 62,854,155 us-gaap_DepreciationDepletionAndAmortization | 50,179,823 us-gaap_DepreciationDepletionAndAmortization
Gain on disposal of assets | (44,410)gntx_GainOnDispositionOnAssets | (54,520)gntx_GainOnDispositionOnAssets | (419,382)gntx_GainOnDispositionOnAssets
Loss on disposal of assets | 640,918 gntx_LossOnDispositionOfAssets | 2,162,610 gntx_LossOnDispositionOfAssets | 952,190 gntx_LossOnDispositionOfAssets
Gain on sale of investments | (16,742,536)us-gaap_GainLossOnSaleOfInvestments | (19,012,429)us-gaap_GainLossOnSaleOfInvestments | (9,584,288)us-gaap_GainLossOnSaleOfInvestments
Loss on sale of investments | 1,149,627 us-gaap_LossOnSaleOfInvestments | 882,918 us-gaap_LossOnSaleOfInvestments | 1,216,027 us-gaap_LossOnSaleOfInvestments
Deferred income taxes | 14,817,959 us-gaap_DeferredIncomeTaxExpenseBenefit | (7,726,800)us-gaap_DeferredIncomeTaxExpenseBenefit | 843,484 us-gaap_DeferredIncomeTaxExpenseBenefit
Stock based compensation expense related to employee stock options, employee stock purchases and restricted stock | 21,276,991 us-gaap_ShareBasedCompensation | 17,427,233 us-gaap_ShareBasedCompensation | 16,433,837 us-gaap_ShareBasedCompensation
Excess tax benefits from stock based compensation | (5,502,339)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | (4,445,064)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | (815,651)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Change in operating assets and liabilities: |  |  |
Accounts receivable | (24,962,114)us-gaap_IncreaseDecreaseInAccountsReceivable | (22,347,450)us-gaap_IncreaseDecreaseInAccountsReceivable | 810,022 us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories | (21,683,721)us-gaap_IncreaseDecreaseInInventories | 39,856,102 us-gaap_IncreaseDecreaseInInventories | 28,823,046 us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other | (21,946,622)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | (2,374,913)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | 14,868,742 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable | 14,946,662 us-gaap_IncreaseDecreaseInAccountsPayable | 13,310,319 us-gaap_IncreaseDecreaseInAccountsPayable | (22,270,571)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued liabilities | (708,190)us-gaap_IncreaseDecreaseInAccruedLiabilities | 13,876,720 us-gaap_IncreaseDecreaseInAccruedLiabilities | 8,221,935 us-gaap_IncreaseDecreaseInAccruedLiabilities
Net cash provided by operating activities | 327,223,109 us-gaap_NetCashProvidedByUsedInOperatingActivities | 317,338,830 us-gaap_NetCashProvidedByUsedInOperatingActivities | 257,846,054 us-gaap_NetCashProvidedByUsedInOperatingActivities
Activity in available-for-sale securities: |  |  |
Sales proceeds | 75,613,807 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 82,862,644 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 38,831,234 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Maturities and calls | 0 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities | 98,142,408 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities | 75,652,000 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Purchases | (80,887,357)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (60,543,153)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (112,545,415)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Plant and equipment additions | (72,518,987)us-gaap_PaymentsToAcquireProductiveAssets | (55,380,457)us-gaap_PaymentsToAcquireProductiveAssets | (117,474,449)us-gaap_PaymentsToAcquireProductiveAssets
Proceeds from sale of plant and equipment | 223,833 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 386,399 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 1,064,614 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Acquisition of businesses, net of cash acquired | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | (698,150,900)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Increase in other assets | (2,144,779)us-gaap_IncreaseDecreaseInOtherOperatingAssets | (573,560)us-gaap_IncreaseDecreaseInOtherOperatingAssets | (17,602,228)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Net cash (used for) investing activities | (79,713,483)us-gaap_NetCashProvidedByUsedInInvestingActivities | (633,256,619)us-gaap_NetCashProvidedByUsedInInvestingActivities | (132,074,244)us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from borrowings on Credit Agreement | 0 us-gaap_ProceedsFromLongTermLinesOfCredit | 275,000,000 us-gaap_ProceedsFromLongTermLinesOfCredit | 0 us-gaap_ProceedsFromLongTermLinesOfCredit
Repayment of long-term debt | (7,500,000)us-gaap_RepaymentsOfLongTermDebt | (1,875,000)us-gaap_RepaymentsOfLongTermDebt | 0 us-gaap_RepaymentsOfLongTermDebt
Deferred financing costs | 0 gntx_PaymentsofDeferredFinancingCosts | (956,441)gntx_PaymentsofDeferredFinancingCosts | 0 gntx_PaymentsofDeferredFinancingCosts
Issuance of common stock from stock plan transactions | 59,969,006 us-gaap_ProceedsFromIssuanceOfCommonStock | 38,377,571 us-gaap_ProceedsFromIssuanceOfCommonStock | 12,208,881 us-gaap_ProceedsFromIssuanceOfCommonStock
Cash dividends paid | (87,632,009)us-gaap_PaymentsOfDividendsCommonStock | (79,160,345)us-gaap_PaymentsOfDividendsCommonStock | (73,387,727)us-gaap_PaymentsOfDividendsCommonStock
Repurchases of common stock | (30,010,882)us-gaap_PaymentsForRepurchaseOfCommonStock | 0 us-gaap_PaymentsForRepurchaseOfCommonStock | (33,716,725)us-gaap_PaymentsForRepurchaseOfCommonStock
Excess tax benefits from stock based compensation | 5,502,339 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 4,445,064 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 815,651 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net cash provided by (used for) financing activities | (59,671,546)us-gaap_NetCashProvidedByUsedInFinancingActivities | 235,830,849 us-gaap_NetCashProvidedByUsedInFinancingActivities | (94,079,920)us-gaap_NetCashProvidedByUsedInFinancingActivities
NET INCREASE IN CASH AND CASH EQUIVALENTS | 187,838,080 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (80,086,940)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 31,691,890 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND CASH EQUIVALENTS, Beginning of year | 309,591,724 us-gaap_CashAndCashEquivalentsAtCarryingValue | 389,678,664 us-gaap_CashAndCashEquivalentsAtCarryingValue | 357,986,774 us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AND CASH EQUIVALENTS, End of year | $ 497,429,804 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 309,591,724 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 389,678,664 us-gaap_CashAndCashEquivalentsAtCarryingValue

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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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