CONSOLIDATED STATEMENTS OF 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)
Purchase of treasury stock from related party	0
Stock withheld for payments of withholding taxes	(4,038)						$ (4,038)
Stock withheld for payments of withholding taxes (in shares)							(70,176)
Issuance of restricted stock awards, net of forfeitures			(8,383)				$ 8,383
Issuance of restricted stock awards, net of forfeitures (in shares)							206,185
Share-based compensation expense	14,090		14,090
Net income	87,160				87,160
Foreign currency translation adjustment	(10)					(10)
Ending Balance at Sep. 30, 2021	1,255,125	$ 419	191,765	(15,458)	1,340,320	(201)	$ (261,720)
Ending Balance (in shares) at Sep. 30, 2021		41,887,088					(7,539,075)
Beginning Balance at Jun. 30, 2021	1,207,076	$ 419	186,210	(15,458)	1,296,982	(176)	$ (260,901)
Beginning Balance (in shares) at Jun. 30, 2021		41,887,088					(7,519,741)
Stock withheld for payments of withholding taxes	(65)						$ (65)
Stock withheld for payments of withholding taxes (in shares)							(968)
Issuance of restricted stock awards, net of forfeitures			754				$ (754)
Issuance of restricted stock awards, net of forfeitures (in shares)							(18,366)
Share-based compensation expense	4,801		4,801
Net income	43,338				43,338
Foreign currency translation adjustment	(25)					(25)
Ending Balance at Sep. 30, 2021	1,255,125	$ 419	191,765	(15,458)	1,340,320	(201)	$ (261,720)
Ending Balance (in shares) at Sep. 30, 2021		41,887,088					(7,539,075)
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)
Purchase of treasury shares	(75,000)						$ (75,000)
Purchase of treasury shares (in shares)							(945,497)
Purchase of treasury stock from related party	(34,767)						$ (34,767)
Purchase of treasury stock from related party (in shares)							(430,121)
Stock withheld for payments of withholding taxes	(5,778)						$ (5,778)
Stock withheld for payments of withholding taxes (in shares)							(69,132)
Issuance of restricted stock awards, net of forfeitures			(1,572)				$ 1,572
Issuance of restricted stock awards, net of forfeitures (in shares)							126,182
Share-based compensation expense	14,973		14,973
Net income	277,674				277,674
Foreign currency translation adjustment	(31)					(31)
Ending Balance at Sep. 30, 2022	1,517,385	$ 419	202,657	(15,458)	1,702,308	(238)	$ (372,303)
Ending Balance (in shares) at Sep. 30, 2022		41,887,088					(8,635,626)
Beginning Balance at Jun. 30, 2022	1,535,189	$ 419	195,603	(15,458)	1,614,983	(203)	$ (260,155)
Beginning Balance (in shares) at Jun. 30, 2022		41,887,088					(7,244,215)
Purchase of treasury shares	(75,000)						$ (75,000)
Purchase of treasury shares (in shares)							(945,497)
Purchase of treasury stock from related party	(34,767)						$ (34,767)
Purchase of treasury stock from related party (in shares)							(430,121)
Stock withheld for payments of withholding taxes	(63)						$ (63)
Stock withheld for payments of withholding taxes (in shares)							(892)
Issuance of restricted stock awards, net of forfeitures			2,318				$ (2,318)
Issuance of restricted stock awards, net of forfeitures (in shares)							(14,901)
Share-based compensation expense	4,736		4,736
Net income	87,325				87,325
Foreign currency translation adjustment	(35)					(35)
Ending Balance at Sep. 30, 2022	$ 1,517,385	$ 419	$ 202,657	$ (15,458)	$ 1,702,308	$ (238)	$ (372,303)
Ending Balance (in shares) at Sep. 30, 2022		41,887,088					(8,635,626)