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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, 2016	$ 628,179	$ 419	$ 173,565	$ (15,458)	$ 735,563	$ (273)	$ (265,637)
Beginning Balance (in shares) at Dec. 31, 2016		41,887,088					(8,031,810)
Stock tendered for payments of withholding taxes	(3,412)						$ (3,412)
Stock tendered for payments of withholding taxes (in shares)							(77,988)
Issuance of restricted stock awards, net of forfeitures			(10,427)				$ 10,427
Issuance of restricted stock awards, net of forfeitures (in shares)							332,076
Share-based compensation expense	9,873		9,873
Net income	135,153				135,153
Foreign currency translation adjustment	79					79
Ending Balance at Dec. 31, 2017	769,872	$ 419	173,011	(15,458)	870,716	(194)	$ (258,622)
Ending Balance (in shares) at Dec. 31, 2017		41,887,088					(7,777,722)
Stock tendered for payments of withholding taxes	(4,270)						$ (4,270)
Stock tendered for payments of withholding taxes (in shares)							(87,381)
Issuance of restricted stock awards, net of forfeitures			(14,271)				$ 14,271
Issuance of restricted stock awards, net of forfeitures (in shares)							434,020
Share-based compensation expense	13,480		13,480
Net income	201,740				201,740
Foreign currency translation adjustment	12					12
Ending Balance at Dec. 31, 2018	980,834	$ 419	172,220	(15,458)	1,072,456	(182)	$ (248,621)
Ending Balance (in shares) at Dec. 31, 2018		41,887,088					(7,431,083)
Purchase of treasury shares	$ (24,998)						$ (24,998)
Purchase of treasury shares (in shares)	(626,320)						(626,320)
Stock tendered for payments of withholding taxes	$ (3,984)						$ (3,984)
Stock tendered for payments of withholding taxes (in shares)							(98,260)
Issuance of restricted stock awards, net of forfeitures			(8,869)				$ 8,869
Issuance of restricted stock awards, net of forfeitures (in shares)							284,775
Share-based compensation expense	16,286		16,286
Net income	107,171				107,171
Adoption of ASC 842 | ASU No. 2016-02 [Member]	(26)				(26)
Foreign currency translation adjustment	(4)					(4)
Ending Balance at Dec. 31, 2019	$ 1,075,279	$ 419	$ 179,637	$ (15,458)	$ 1,179,601	$ (186)	$ (268,734)
Ending Balance (in shares) at Dec. 31, 2019		41,887,088					(7,870,888)

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