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UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Class A and B Common Stock [Member]	Additional Paid-in Capital [Member]	Purchase Price Of Excess Of Predecessor Basis, Net Of Tax [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2017	$ 769,872	$ 419	$ 173,011	$ (15,458)	$ 870,716	$ (194)	$ (258,622)
Beginning Balance (in shares) at Dec. 31, 2017		41,887,088					(7,777,722)
Stock tendered for payments of withholding taxes	(3,894)						$ (3,894)
Stock tendered for payments of withholding taxes (in shares)							(79,490)
Issuance of restricted stock awards, net of forfeitures			(11,433)				$ 11,433
Issuance of restricted stock awards, net of forfeitures (in shares)							347,025
Share-based compensation expense	3,500		3,500
Net income	16,167				16,167
Foreign currency translation adjustment	29					29
Ending Balance at Mar. 31, 2018	785,674	$ 419	165,078	(15,458)	886,883	(165)	$ (251,083)
Ending Balance (in shares) at Mar. 31, 2018		41,887,088					(7,510,187)
Beginning Balance at Dec. 31, 2018	980,834	$ 419	172,220	(15,458)	1,072,456	(182)	$ (248,621)
Beginning Balance (in shares) at Dec. 31, 2018		41,887,088					(7,431,083)
Stock tendered for payments of withholding taxes	(2,578)						$ (2,578)
Stock tendered for payments of withholding taxes (in shares)							(68,908)
Issuance of restricted stock awards, net of forfeitures			(13,813)				$ 13,813
Issuance of restricted stock awards, net of forfeitures (in shares)							385,681
Share-based compensation expense	4,933		4,933
Net income	23,894				23,894
Adoption of ASU 2016-02 | ASU No. 2016-02 [Member]	(26)				(26)
Foreign currency translation adjustment	7					7
Ending Balance at Mar. 31, 2019	$ 1,007,064	$ 419	$ 163,340	$ (15,458)	$ 1,096,324	$ (175)	$ (237,386)
Ending Balance (in shares) at Mar. 31, 2019		41,887,088					(7,114,310)

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The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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Amount of increase to additional paid-in capital (APIC) from recognition of equity-based compensation.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.

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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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