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Employee Benefit Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Contribution Plan Disclosure [Line Items] |  |  |
Salary deferral contribution rate, minimum | 1.00% |  |
Salary deferral contributions rate, maximum | 50.00% |  |
Employer matching contribution |  | 5.00% | 4.50%
Matching contributions recorded in compensation and related expense | $ 6.8 | $ 6.6 | $ 5.7
Number of hours of service for vesting, per year | 1000 hours |  |
Number of years of service for vesting | 2 years |  |
Annual vesting percentage | 20.00% |  |
Number of years for incremental percentage vesting until participant fully vested in company's matching contribution | 4 years |  |
Maximum number of shares of class B common stock for employee stock purchase plan | 750,000 |  |
Employee stock purchase plan, maximum annual contributions per employee, Percent | 10.00% |  |
Number of shares purchased by employees | 10,278 |  |
Number of shares purchased by employees since inception | 212,113 |  |
First Salary Deferral Contribution |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employer matching contribution |  | 100.00% | 100.00%
Percent of employees' gross pay |  | 4.00% | 3.00%
Second Salary Deferral Contribution |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employer matching contribution |  | 50.00% | 50.00%
Percent of employees' gross pay |  | 2.00% | 3.00%

X
- Definition The number of years an employee must provide service to the Company after the initial vesting until the employee is fully vested in the employer matching contributions. + References No definition available. + Details
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- Definition The number of hours an employee must provide service to the Company each year in order to be eligible to receive employer matching contributions. + References No definition available. + Details
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- Definition The number of years an employee must provide service to the Company in order to be eligible to receive employer matching contributions. + References No definition available. + Details
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- Definition Defined Contribution Plan, Minimum Annual Contributions Per Employee, Percent + References No definition available. + Details
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- Definition Defined Contribution Plan Number Of Shares Of Class B Common Stock Purchased Under Plan During Current Year + References No definition available. + Details
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- Definition Employee Stock Purchase Plans, Maximum Annual Contributions Per Employee, Percent + References No definition available. + Details
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- Definition Employee Stock Purchase Plans, Number Of Shares Authorized + References No definition available. + Details
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- Definition The total number of shares of Class B common stock purchased under the employee stock purchase plan since inception. + References No definition available. + Details
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X
- 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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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- Definition Percentage of employer's matching contributions to a defined contribution plan that vests in a given year. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Details
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- Details
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