CONSOLIDATED STATEMENTS STOCKHOLDERS EQUITY - USD ($) $ in Thousands	Total	Class A and B Common Stock [Member]	Additional Paid-in Capital [Member]	Purchase Price in Excess Of Predecessor Basis, Net Of Tax [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2020	$ 1,157,923	$ 419	$ 186,058	$ (15,458)	$ 1,253,160	$ (191)	$ (266,065)
Beginning Balance (in shares) at Dec. 31, 2020		41,887,088					(7,675,084)
Stock withheld for payments of withholding taxes	(3,973)						$ (3,973)
Stock withheld for payments of withholding taxes (in shares)							(69,208)
Issuance of restricted stock awards, net of forfeitures			(9,137)				$ 9,137
Issuance of restricted stock awards, net of forfeitures (in shares)							224,551
Share-based compensation expense	9,289		9,289
Net income	43,822				43,822
Foreign currency translation adjustment	15					15
Ending Balance at Jun. 30, 2021	1,207,076	$ 419	186,210	(15,458)	1,296,982	(176)	$ (260,901)
Ending Balance (in shares) at Jun. 30, 2021		41,887,088					(7,519,741)
Beginning Balance at Mar. 31, 2021	1,176,501	$ 419	182,005	(15,458)	1,270,390	(201)	$ (260,654)
Beginning Balance (in shares) at Mar. 31, 2021		41,887,088					(7,469,756)
Stock withheld for payments of withholding taxes	(214)						$ (214)
Stock withheld for payments of withholding taxes (in shares)							(3,229)
Issuance of restricted stock awards, net of forfeitures			33				$ (33)
Issuance of restricted stock awards, net of forfeitures (in shares)							(46,756)
Share-based compensation expense	4,172		4,172
Net income	26,592				26,592
Foreign currency translation adjustment	25					25
Ending Balance at Jun. 30, 2021	1,207,076	$ 419	186,210	(15,458)	1,296,982	(176)	$ (260,901)
Ending Balance (in shares) at Jun. 30, 2021		41,887,088					(7,519,741)
Beginning Balance at Dec. 31, 2021	1,340,314	$ 419	189,256	(15,458)	1,424,634	(207)	$ (258,330)
Beginning Balance (in shares) at Dec. 31, 2021		41,887,088					(7,317,058)
Stock withheld for payments of withholding taxes	(5,715)						$ (5,715)
Stock withheld for payments of withholding taxes (in shares)							(68,240)
Issuance of restricted stock awards, net of forfeitures			(3,890)				$ 3,890
Issuance of restricted stock awards, net of forfeitures (in shares)							141,083
Share-based compensation expense	10,237		10,237
Net income	190,349				190,349
Foreign currency translation adjustment	4					4
Ending Balance at Jun. 30, 2022	1,535,189	$ 419	195,603	(15,458)	1,614,983	(203)	$ (260,155)
Ending Balance (in shares) at Jun. 30, 2022		41,887,088					(7,244,215)
Beginning Balance at Mar. 31, 2022	1,426,971	$ 419	189,168	(15,458)	1,512,137	(187)	$ (259,108)
Beginning Balance (in shares) at Mar. 31, 2022		41,887,088					(7,236,001)
Stock withheld for payments of withholding taxes	(130)						$ (130)
Stock withheld for payments of withholding taxes (in shares)							1,871
Issuance of restricted stock awards, net of forfeitures			917				$ (917)
Issuance of restricted stock awards, net of forfeitures (in shares)							(6,343)
Share-based compensation expense	5,518		5,518
Net income	102,846				102,846
Foreign currency translation adjustment	(16)					(16)
Ending Balance at Jun. 30, 2022	$ 1,535,189	$ 419	$ 195,603	$ (15,458)	$ 1,614,983	$ (203)	$ (260,155)
Ending Balance (in shares) at Jun. 30, 2022		41,887,088					(7,244,215)