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Employee Benefit Plan | 12 Months Ended
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Dec. 31, 2019
Retirement Benefits [Abstract] |
Employee Benefit Plan | EMPLOYEE BENEFIT PLAN The Company has a 401(k) retirement savings plan in which substantially all of its employees may participate. The plan includes a provision for the Company to match a percentage of the employee’s contributions at a rate determined by the Company’s Board of Directors. In 2019, 2018 and 2017 the Company’s contributions were approximately $8.7 million, $8.2 million and $7.7 million, respectively. The increase in each of the years was due to increased employee participation in the plan. The Company does not provide health care benefits to retired employees. The Gentex Corporation Non-Qualified Deferred Compensation Plan (the "Deferred Compensation Plan") is intended to enhance retirement savings among a select group of management or highly compensated employees who contribute significantly to the success of the Company. It is also intended to constitute an unfunded non-qualified deferred compensation plan described in Sections 201(2), 301(a)(3), and 401(a)(1) of the Employee Retirement Income Security Act of 1974, as amended ("ERISA"). Only select management and highly compensated employees, including executive officers, are eligible to participate. The Deferred Compensation Plan is administered by a committee who shall approve designation of any participants and may also remove participants. Participants may elect, on a pre-tax basis, to defer receipt of compensation by making an election in accordance with the terms of the Deferred Compensation Plan. Participants are immediately vested in their own deferrals and related earnings. The Company may, but is not required, to match participant deferrals. Participants are generally vested in any such matching contributions 50% after two years but before three years of service and 100% after three years of service. A participant's vested credit balance under the Deferred Compensation Plan will generally be paid on the earliest to occur of: a separation from service; a fixed date or event; a change of control; or a plan termination. A participant can elect whether to receive his or her vested credit balance in a lump sum on the relevant payment date or in installments thereafter.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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