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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, 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 withheld for payments of withholding taxes	(2,578)						$ (2,578)
Stock withheld 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)
Beginning Balance at Dec. 31, 2019	1,075,279	$ 419	179,637	(15,458)	1,179,601	(186)	$ (268,734)
Beginning Balance (in shares) at Dec. 31, 2019		41,887,088					(7,870,888)
Stock withheld for payments of withholding taxes	(3,769)						$ (3,769)
Stock withheld for payments of withholding taxes (in shares)							(71,717)
Issuance of restricted stock awards, net of forfeitures			(8,364)				$ 8,364
Issuance of restricted stock awards, net of forfeitures (in shares)							262,100
Share-based compensation expense	4,097		4,097
Net income	13,236				13,236
Foreign currency translation adjustment	(134)					(134)
Ending Balance at Mar. 31, 2020	$ 1,088,709	$ 419	$ 175,370	$ (15,458)	$ 1,192,837	$ (320)	$ (264,139)
Ending Balance (in shares) at Mar. 31, 2020		41,887,088					(7,680,505)

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