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Employee Benefit Plans (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Employer matching contribution |  | 4.50% | 4.00% |
Matching contributions recorded in compensation and related expense |  | $ 5.7 | $ 5.0 | $ 4.8
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 |  | 8,706 |  |
Number of shares purchased by employees since inception |  | 194,224 |  |
Subsequent Event |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Employer matching contribution | 5.00% |  |  |
First Salary Deferral Contribution |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Employer matching contribution |  | 100.00% | 100.00% |
Percent of employees' gross pay |  | 3.00% | 2.00% |
First Salary Deferral Contribution | Subsequent Event |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Employer matching contribution | 100.00% |  |  |
Percent of employees' gross pay | 4.00% |  |  |
Second Salary Deferral Contribution |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Employer matching contribution |  | 50.00% | 50.00% |
Percent of employees' gross pay |  | 3.00% | 4.00% |
Second Salary Deferral Contribution | Subsequent Event |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Employer matching contribution | 50.00% |  |  |
Percent of employees' gross pay | 2.00% |  |  |
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 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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