CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Losses
Beginning Balance at Dec. 31, 2018	$ 1,096,162	$ 376	$ 34,953	$ 1,205,946	$ (145,113)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency translation adjustment	1,550				1,550
Net income (loss)	1,720			1,720
Comprehensive income (loss)	3,270
Repurchase of common stock	(26,570)	(6)		(26,564)
Options exercised and awards vested	2,181		2,181
Stock option expense	15,721		15,721
Other	(63)	1	15	(79)
Ending Balance at Dec. 31, 2019	1,090,701	371	52,870	1,181,023	(143,563)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency translation adjustment	(6,148)				(6,148)
Net income (loss)	(30,768)			(30,768)
Comprehensive income (loss)	(36,916)
Repurchase of common stock	(25,000)	(8)		(24,992)
Shares withheld for payment of employee payroll taxes	(171)		(171)
Stock option expense	12,914		12,914
Ending Balance at Dec. 31, 2020	1,041,528	363	65,613	1,125,263	(149,711)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency translation adjustment	(6,874)				(6,874)
Net income (loss)	(127,996)			(127,996)
Comprehensive income (loss)	(134,870)
Repurchase of common stock	(24,191)	(11)		(24,180)
Shares withheld for payment of employee payroll taxes	(254)		(254)
Stock option expense	14,895		14,895
Ending Balance at Dec. 31, 2021	$ 897,108	$ 352	$ 80,254	$ 973,087	$ (156,585)