CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2019	$ 1,129,968	$ 702	$ 667,658	$ 930,830	$ (377,639)	$ (91,583)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(24,427)			(24,427)
Other comprehensive loss	(6,169)					(6,169)
Stock-based compensation	6,950		6,950
Shares issued and forfeited, net, under stock plans	1,330		(17,885)		19,215
Repurchase of 1,000,000 shares of common stock	(28,881)				(28,881)
Repurchase of stock-based compensation awards for tax withholdings	(10,973)				(10,973)
Ending balance at Mar. 31, 2020	1,067,798	702	656,723	906,403	(398,278)	(97,752)
Beginning balance at Dec. 31, 2020	1,206,597	702	682,431	1,003,490	(387,581)	(92,445)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(1,945)			(1,945)
Other comprehensive loss	(3,116)					(3,116)
Stock-based compensation	6,703		6,703
Shares issued and forfeited, net, under stock plans	3,684		(19,116)		22,800
Repurchase of stock-based compensation awards for tax withholdings	(14,206)				(14,206)
Ending balance at Mar. 31, 2021	$ 1,197,717	$ 702	$ 670,018	$ 1,001,545	$ (378,987)	$ (95,561)