CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income	Stock Repurchase Program	Total
Balances at Dec. 31, 2021	$ 294	$ 318,033	$ 801,314	$ (194,273)	$ 3,699		$ 929,067
Balances (in shares) at Dec. 31, 2021	29,360,000
Balances, Treasury stock (in shares) at Dec. 31, 2021				4,493,000
Increase (Decrease) in Stockholders' Equity
Net income			260,872				260,872
Other comprehensive income (loss), net of tax					279		279
Issuance of common stock under share-based compensation plans	$ 3	(3)
Issuance of common stock under share-based compensation plans (in shares)	388,000
Shares withheld for employee tax remittance on share-based compensation		(15,733)					(15,733)
Share-based compensation expense		9,816					9,816
Purchase of treasury stock				$ (50,117)			(50,117)
Purchase of treasury stock (in shares)				634,000
Forward contract for accelerated share repurchase		25,000		$ (25,000)
Forward contract for accelerated share repurchase (in shares)				214,000
Dividends declared on common stock			(7,892)				(7,892)
Balances at Sep. 30, 2022	$ 297	337,113	1,054,294	$ (269,390)	3,978		1,126,292
Balances (in shares) at Sep. 30, 2022	29,748,000
Balances, Treasury stock (in shares) at Sep. 30, 2022				5,341,000
Balances at Jun. 30, 2022	$ 296	340,035	968,417	$ (250,510)	4,974		1,063,212
Balances (in shares) at Jun. 30, 2022	29,615,000
Balances, Treasury stock (in shares) at Jun. 30, 2022				5,109,000
Increase (Decrease) in Stockholders' Equity
Net income			88,842				88,842
Other comprehensive income (loss), net of tax					(996)		(996)
Issuance of common stock under share-based compensation plans	$ 1	(1)
Issuance of common stock under share-based compensation plans (in shares)	133,000
Shares withheld for employee tax remittance on share-based compensation		(6,096)					(6,096)
Share-based compensation expense		3,175					3,175
Purchase of treasury stock				$ (18,880)			(18,880)
Purchase of treasury stock (in shares)				232,000
Dividends declared on common stock			(2,965)				(2,965)
Balances at Sep. 30, 2022	$ 297	337,113	1,054,294	$ (269,390)	3,978		1,126,292
Balances (in shares) at Sep. 30, 2022	29,748,000
Balances, Treasury stock (in shares) at Sep. 30, 2022				5,341,000
Balances at Dec. 31, 2022	$ 298	339,582	1,088,693	$ (284,275)	7,103		$ 1,151,401
Balances (in shares) at Dec. 31, 2022	29,759,000
Balances, Treasury stock (in shares) at Dec. 31, 2022				5,529,000			5,529,383
Increase (Decrease) in Stockholders' Equity
Net income			146,643				$ 146,643
Other comprehensive income (loss), net of tax					(1,517)		(1,517)
Issuance of common stock under share-based compensation plans	$ 2	(2)
Issuance of common stock under share-based compensation plans (in shares)	259,000
Shares withheld for employee tax remittance on share-based compensation		(10,056)					(10,056)
Share-based compensation expense		8,844					8,844
Purchase of treasury stock				$ (65,886)		$ (65,900)	(65,886)
Purchase of treasury stock (in shares)				689,000		688,502
Dividends declared on common stock			(8,696)				(8,696)
Balances at Sep. 30, 2023	$ 300	338,368	1,226,640	$ (350,161)	5,586		$ 1,220,733
Balances (in shares) at Sep. 30, 2023	30,018,000
Balances, Treasury stock (in shares) at Sep. 30, 2023				6,218,000			6,217,885
Balances at Jun. 30, 2023	$ 300	335,397	1,194,610	$ (325,515)	6,569		$ 1,211,361
Balances (in shares) at Jun. 30, 2023	30,008,000
Balances, Treasury stock (in shares) at Jun. 30, 2023				5,983,000
Increase (Decrease) in Stockholders' Equity
Net income			34,917				34,917
Other comprehensive income (loss), net of tax					(983)		(983)
Issuance of common stock under share-based compensation plans (in shares)	10,000
Shares withheld for employee tax remittance on share-based compensation		(34)					(34)
Share-based compensation expense		3,005					3,005
Purchase of treasury stock				$ (24,646)			(24,646)
Purchase of treasury stock (in shares)				235,000
Dividends declared on common stock			(2,887)				(2,887)
Balances at Sep. 30, 2023	$ 300	$ 338,368	$ 1,226,640	$ (350,161)	$ 5,586		$ 1,220,733
Balances (in shares) at Sep. 30, 2023	30,018,000
Balances, Treasury stock (in shares) at Sep. 30, 2023				6,218,000			6,217,885