CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Previously Reported	Revision of Prior Period, Accounting Standards Update, Adjustment	Common Stock	Common Stock Previously Reported	Treasury Stock	Treasury Stock Previously Reported	Additional Paid-in Capital	Additional Paid-in Capital Previously Reported	(Accumulated Deficit) Retained Earnings	(Accumulated Deficit) Retained Earnings Previously Reported	(Accumulated Deficit) Retained Earnings Revision of Prior Period, Accounting Standards Update, Adjustment	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Previously Reported
Balance at Dec. 31, 2018	$ 598,856	$ 589,703	$ 9,153	$ 356	$ 356	$ (6,030)	$ (6,030)	$ 639,381	$ 639,381	$ (32,334)	$ (41,487)	$ 9,153	$ (2,517)	$ (2,517)
Accounting Standards Update [Extensible List]			ASU 2016-02									ASU 2016-02
Balance at Jan. 01, 2019	598,856
Balance at Dec. 31, 2018	598,856	$ 589,703	$ 9,153	356	$ 356	(6,030)	$ (6,030)	639,381	$ 639,381	(32,334)	$ (41,487)	$ 9,153	(2,517)	$ (2,517)
Net income	100,443									100,443
Foreign currency translation	(224)												(224)
Stock-based compensation expense	20,741							20,741
Stock options exercised	6,467			4				6,463
Balance at Dec. 31, 2019	726,283			360		(6,030)		666,585		68,109			(2,741)
Net income	145,384									145,384
Foreign currency translation	2,610												2,610
Stock-based compensation expense	13,784							13,784
Stock options exercised	15,992			5		452		15,535
Repurchases of common stock	(98,274)			(10)						(98,264)
Balance at Dec. 31, 2020	805,779			355		(5,578)		695,904		115,229			(131)
Net income	181,848									181,848
Foreign currency translation	(4,715)												(4,715)
Stock-based compensation expense	14,469							14,469
Stock options exercised	17,643			8		151		17,484
Repurchases of common stock	(62,096)			(3)						(62,093)
Balance at Dec. 31, 2021	$ 952,928			$ 360		$ (5,427)		$ 727,857		$ 234,984			$ (4,846)