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Retirement Plans - Safe Harbor plan (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Employees' savings plan |  |  |
Matching contribution by the company (as a percent) | 100.00% |  |
Expenses recognized under 401(K) plan | $ 10,962 | $ 6,659 | $ 7,948
Minimum |  |  |
Employees' savings plan |  |  |
Age of employees to be eligible to participate in the defined contribution plan | 18 years |  |
Percentage of annual base compensation that participants may elect to contribute | 1.00% |  |
Maximum |  |  |
Employees' savings plan |  |  |
Percentage of annual base compensation that participants may elect to contribute | 50.00% |  |
Percentage of employees salary for which the company contributes a matching contribution | 4.00% |  |
Discretionary matching contribution (as a percent) |  |  | 2.00%

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- Definition Represents employee contributions to a defined contribution pension plan as a percentage of annual base compensation. + References No definition available. + Details
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- Definition The percentage of the employee contribution for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Details
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