Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income / (Loss)	Retained Earnings
Beginning balance (in shares) at Dec. 31, 2020		38,803
Beginning balance at Dec. 31, 2020	$ 421,925	$ 389	$ (100,027)	$ 360,939	$ (7,681)	$ 168,305
Beginning balance (in shares) at Dec. 31, 2020			2,558
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation	17,896			17,896
Issuance of common stock in connection with employee stock option exercises and RSU vesting (in shares)		601
Issuance of common stock in connection with employee stock option exercises and RSU vesting	1,801	$ 6		1,795
Common shares withheld for settlement of taxes in connection with equity-based compensation (in shares)		(231)
Common shares withheld for settlement of taxes in connection with equity-based compensation	(20,229)	$ (3)		(20,226)
Cash dividends paid	(15,317)					(15,317)
Other comprehensive income (loss)	290				290
Net income	58,968					58,968
Ending balance (in shares) at Jun. 30, 2021		39,173
Ending balance at Jun. 30, 2021	465,334	$ 392	$ (100,027)	360,404	(7,391)	211,956
Ending balance (in shares) at Jun. 30, 2021			2,558
Beginning balance (in shares) at Mar. 31, 2021		39,010
Beginning balance at Mar. 31, 2021	440,504	$ 391	$ (100,027)	357,422	(7,455)	190,173
Beginning balance (in shares) at Mar. 31, 2021			2,558
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation	9,686			9,686
Issuance of common stock in connection with employee stock option exercises and RSU vesting (in shares)		244
Issuance of common stock in connection with employee stock option exercises and RSU vesting	492	$ 2		490
Common shares withheld for settlement of taxes in connection with equity-based compensation (in shares)		(81)
Common shares withheld for settlement of taxes in connection with equity-based compensation	(7,195)	$ (1)		(7,194)
Cash dividends paid	(7,671)					(7,671)
Other comprehensive income (loss)	64				64
Net income	29,454					29,454
Ending balance (in shares) at Jun. 30, 2021		39,173
Ending balance at Jun. 30, 2021	$ 465,334	$ 392	$ (100,027)	360,404	(7,391)	211,956
Ending balance (in shares) at Jun. 30, 2021			2,558
Beginning balance (in shares) at Dec. 31, 2021	36,417	39,209
Beginning balance at Dec. 31, 2021	$ 468,482	$ 392	$ (127,196)	376,537	(10,788)	229,537
Beginning balance (in shares) at Dec. 31, 2021	2,792		2,792
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation	$ 14,870			14,870
Issuance of common stock in connection with employee stock option exercises and RSU vesting (in shares)		503
Issuance of common stock in connection with employee stock option exercises and RSU vesting	568	$ 5		563
Common shares withheld for settlement of taxes in connection with equity-based compensation (in shares)		(230)
Common shares withheld for settlement of taxes in connection with equity-based compensation	(21,038)	$ (2)		(21,036)
Repurchase of treasury shares (in shares)			709
Repurchase of treasury shares	(56,604)		$ (56,604)
Cash dividends paid	(17,371)					(17,371)
Other comprehensive income (loss)	(5,831)				(5,831)
Net income	$ 46,017					46,017
Ending balance (in shares) at Jun. 30, 2022	35,981	39,482
Ending balance at Jun. 30, 2022	$ 429,093	$ 395	$ (183,800)	370,934	(16,619)	258,183
Ending balance (in shares) at Jun. 30, 2022	3,501		3,501
Beginning balance (in shares) at Mar. 31, 2022		39,352
Beginning balance at Mar. 31, 2022	$ 444,423	$ 394	$ (165,465)	373,765	(11,674)	247,403
Beginning balance (in shares) at Mar. 31, 2022			3,214
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation	7,044			7,044
Issuance of common stock in connection with employee stock option exercises and RSU vesting (in shares)		242
Issuance of common stock in connection with employee stock option exercises and RSU vesting	568	$ 2		566
Common shares withheld for settlement of taxes in connection with equity-based compensation (in shares)		(112)
Common shares withheld for settlement of taxes in connection with equity-based compensation	(10,442)	$ (1)		(10,441)
Repurchase of treasury shares (in shares)			287
Repurchase of treasury shares	(18,335)		$ (18,335)
Cash dividends paid	(8,665)					(8,665)
Other comprehensive income (loss)	(4,945)				(4,945)
Net income	$ 19,445					19,445
Ending balance (in shares) at Jun. 30, 2022	35,981	39,482
Ending balance at Jun. 30, 2022	$ 429,093	$ 395	$ (183,800)	$ 370,934	$ (16,619)	$ 258,183
Ending balance (in shares) at Jun. 30, 2022	3,501		3,501