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Employee Benefit Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employer matching contribution | 5.00% | 4.50% | 4.00%
Matching contributions recorded in compensation and related expense | $ 6.6 | $ 5.7 | $ 5.0
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 | 7,611 |  |
Number of shares purchased by employees since inception | 201,835 |  |
First Salary Deferral Contribution |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employer matching contribution | 100.00% | 100.00% | 100.00%
Percent of employees' gross pay | 4.00% | 3.00% | 2.00%
Second Salary Deferral Contribution |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employer matching contribution | 50.00% | 50.00% | 50.00%
Percent of employees' gross pay | 2.00% | 3.00% | 4.00%
Minimum |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Salary deferral contributions rate | 1.00% |  |
Maximum |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Salary deferral contributions rate | 50.00% |  |

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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 Number Of Shares Of Class B Common Stock Purchased Under Plan During Current Year + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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