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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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X

- 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

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- Definition

Defined Contribution Plan, Minimum Annual Contributions Per Employee, Percent

+ References

No definition available.

+ Details

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X

- 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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X

- Definition

Employee Stock Purchase Plans, Maximum Annual Contributions Per Employee, Percent

+ References

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+ Details

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X

- Definition

Employee Stock Purchase Plans, Number Of Shares Authorized

+ References

No definition available.

+ Details

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X

- 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

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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.

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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.

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

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X

- 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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X

- 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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