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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 income (loss)	(10,352)			(10,352)
Other comprehensive income	(6,751)					(6,751)
Stock-based compensation	14,882		14,882
Shares issued and forfeited, net, under stock plans	2,995		(14,986)		17,981
Repurchase of 1,000,000 shares of common stock	(28,881)				(28,881)
Repurchase of stock-based compensation awards for tax withholdings	(11,124)				(11,124)
Ending balance at Jun. 30, 2020	1,090,737	702	667,554	920,478	(399,663)	(98,334)
Beginning balance at Mar. 31, 2020	1,067,798	702	656,723	906,403	(398,278)	(97,752)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	14,075			14,075
Other comprehensive income	(582)					(582)
Stock-based compensation	7,932		7,932
Shares issued and forfeited, net, under stock plans	1,665		2,899		(1,234)
Repurchase of stock-based compensation awards for tax withholdings	(151)				(151)
Ending balance at Jun. 30, 2020	1,090,737	702	667,554	920,478	(399,663)	(98,334)
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 income (loss)	4,556			4,556
Other comprehensive income	(1,650)					(1,650)
Stock-based compensation	14,423		14,423
Shares issued and forfeited, net, under stock plans	8,841		(20,455)		29,296
Repurchase of 1,000,000 shares of common stock	(39,411)				(39,411)
Repurchase of stock-based compensation awards for tax withholdings	(14,796)				(14,796)
Ending balance at Jun. 30, 2021	1,178,560	702	676,399	1,008,046	(412,492)	(94,095)
Beginning balance at Mar. 31, 2021	1,197,717	702	670,018	1,001,545	(378,987)	(95,561)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	6,501			6,501
Other comprehensive income	1,466					1,466
Stock-based compensation	7,720		7,720
Shares issued and forfeited, net, under stock plans	5,157		(1,339)		6,496
Repurchase of 1,000,000 shares of common stock	(39,411)				(39,411)
Repurchase of stock-based compensation awards for tax withholdings	(590)				(590)
Ending balance at Jun. 30, 2021	$ 1,178,560	$ 702	$ 676,399	$ 1,008,046	$ (412,492)	$ (94,095)

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