CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Beginning balance (in shares) at Dec. 31, 2020		116,735
Beginning balance at Dec. 31, 2020	$ 523,338	$ 122	$ 516,140	$ (75,795)	$ 415	$ 82,456
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of options (in shares)	1,800	1,832
Issuance of common stock upon exercise of options	$ 10,083	$ 2	10,081
Purchases of treasury stock (in shares)	(21,300)	(1,282)
Purchases of treasury stock	$ (33,540)			(33,540)
Shares purchased to satisfy cost and statutory withholding requirements for net settlement of cashless option exercises	(800)	(808)
Shares purchased to satisfy cost and statutory withholding requirements for net settlement of cashless option exercises	$ (22,520)			(22,520)
Stock-based compensation	10,142		10,142
Other comprehensive income (loss), net of tax	(166)				(166)
Net income	23,465					23,465
Ending balance (in shares) at Mar. 31, 2021		116,477
Ending balance at Mar. 31, 2021	510,802	$ 124	536,363	(131,855)	249	105,921
Beginning balance (in shares) at Dec. 31, 2021		105,940
Beginning balance at Dec. 31, 2021	$ 375,806	$ 127	591,349	(410,411)	(227)	194,968
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of options (in shares)	600	586
Issuance of common stock upon exercise of options	$ 6,544	$ 1	6,543
Purchases of treasury stock (in shares)	(21,600)
Shares purchased to satisfy cost and statutory withholding requirements for net settlement of cashless option exercises	(300)	(305)
Shares purchased to satisfy cost and statutory withholding requirements for net settlement of cashless option exercises	$ (7,037)			(7,037)
Stock-based compensation	10,825		10,825
Other comprehensive income (loss), net of tax	(1,124)				(1,124)
Net income	22,797					22,797
Ending balance (in shares) at Mar. 31, 2022		106,221
Ending balance at Mar. 31, 2022	$ 407,811	$ 128	$ 608,717	$ (417,448)	$ (1,351)	$ 217,765