Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation expense	$ 20,682	$ 19,877	$ 19,619
Time-based restricted stock(1)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation expense	$ 4,256	7,200	5,492
Time-based restricted stock units(1)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted (shares)	992,825
Stock based compensation expense	$ 9,395	$ 5,690	$ 7,778
Performance-based restricted stock(2)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance unit awards granted period	3 years	3 years	3 years
Awards granted (shares)	376,166
Stock based compensation expense	$ 4,332	$ 6,987	$ 6,349
Performance-based restricted stock(2) \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance share awards actual payout percentage	200.00%	200.00%
Performance-based RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation expense	$ 2,699	$ 0	$ 0
Class A common stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized	12,700,000
Number of shares available for grant	7,900,000

Performance share awards actual payout percentage.

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- Definition

Performance period

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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