CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Treasury Stock	Additional Paid-In Capital	Additional Paid-In Capital Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment
Balance Beginning of Period, Shares (in shares) at Dec. 31, 2019			88,735,000
Balance, Beginning of Period at Dec. 31, 2019	$ 1,416,736	$ (200)	$ 887	$ (119,943)	$ 1,213,620		$ (76,402)	$ 398,574	$ (200)
Balance, Beginning of Period, Treasury Stock, Shares (in shares) at Dec. 31, 2019				(2,865,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	9,180							9,180
Other comprehensive income (loss), net of tax	(28,187)						(28,187)
Issuance of common stock through employee stock purchase plan (in shares)			13,000
Issuance of common stock through employee stock purchase plan	694				694
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes (in shares)			357,000	10,000
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes	(2,739)		$ 2	$ 476	(3,217)
Share-based compensation	3,781				3,781
Share repurchase and equity component of the convertible note issuance, net (in shares)				(135,000)
Share repurchase and equity component of the convertible note issuance, net	34,906			$ (7,632)	42,538
Accelerated shares repurchased (in shares)				(1,304,000)
Accelerated shares repurchased	(92,368)			$ (75,407)	(16,961)
Balance End of Period, Shares (in shares) at Mar. 31, 2020			89,105,000
Balance, End of Period at Mar. 31, 2020	1,341,803		$ 889	$ (202,506)	1,240,455		(104,589)	407,554
Balance, End of Period, Treasury Stock, Shares (in shares) at Mar. 31, 2020				(4,294,000)
Balance Beginning of Period, Shares (in shares) at Dec. 31, 2019			88,735,000
Balance, Beginning of Period at Dec. 31, 2019	1,416,736	(200)	$ 887	$ (119,943)	1,213,620		(76,402)	398,574	(200)
Balance, Beginning of Period, Treasury Stock, Shares (in shares) at Dec. 31, 2019				(2,865,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	41,148
Balance End of Period, Shares (in shares) at Sep. 30, 2020			89,191,000
Balance, End of Period at Sep. 30, 2020	1,397,988		$ 892	$ (235,224)	1,284,711		(91,913)	439,522
Balance, End of Period, Treasury Stock, Shares (in shares) at Sep. 30, 2020				(4,915,000)
Balance Beginning of Period, Shares (in shares) at Dec. 31, 2019			88,735,000
Balance, Beginning of Period at Dec. 31, 2019	$ 1,416,736	(200)	$ 887	$ (119,943)	1,213,620		(76,402)	398,574	(200)
Balance, Beginning of Period, Treasury Stock, Shares (in shares) at Dec. 31, 2019				(2,865,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accelerated shares repurchased (in shares)	(2,100,000)
Balance End of Period, Shares (in shares) at Dec. 31, 2020			89,251,000
Balance, End of Period at Dec. 31, 2020	$ 1,514,867	(66,046)	$ 893	$ (235,141)	1,290,909	$ (63,274)	(74,059)	532,265	(2,772)
Balance, End of Period, Treasury Stock, Shares (in shares) at Dec. 31, 2020	(4,914,000)			(4,914,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]
Balance Beginning of Period, Shares (in shares) at Mar. 31, 2020			89,105,000
Balance, Beginning of Period at Mar. 31, 2020	$ 1,341,803		$ 889	$ (202,506)	1,240,455		(104,589)	407,554
Balance, Beginning of Period, Treasury Stock, Shares (in shares) at Mar. 31, 2020				(4,294,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(369)							(369)
Other comprehensive income (loss), net of tax	1,464						1,464
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes (in shares)			84,000
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes	1,250		$ 3	$ (35)	1,282
Share-based compensation	4,948				4,948
Accelerated shares repurchased (in shares)				(621,000)
Accelerated shares repurchased	0			$ (32,685)	32,685
Balance End of Period, Shares (in shares) at Jun. 30, 2020			89,189,000
Balance, End of Period at Jun. 30, 2020	1,349,096		$ 892	$ (235,226)	1,279,370		(103,125)	407,185
Balance, End of Period, Treasury Stock, Shares (in shares) at Jun. 30, 2020				(4,915,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	32,337							32,337
Other comprehensive income (loss), net of tax	11,212						11,212
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes (in shares)			2,000
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes	(67)		$ 0	$ 2	(69)
Share-based compensation	5,410				5,410
Balance End of Period, Shares (in shares) at Sep. 30, 2020			89,191,000
Balance, End of Period at Sep. 30, 2020	1,397,988		$ 892	$ (235,224)	1,284,711		(91,913)	439,522
Balance, End of Period, Treasury Stock, Shares (in shares) at Sep. 30, 2020				(4,915,000)
Balance Beginning of Period, Shares (in shares) at Dec. 31, 2020			89,251,000
Balance, Beginning of Period at Dec. 31, 2020	$ 1,514,867	(66,046)	$ 893	$ (235,141)	1,290,909	(63,274)	(74,059)	532,265	(2,772)
Balance, Beginning of Period, Treasury Stock, Shares (in shares) at Dec. 31, 2020	(4,914,000)			(4,914,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 45,394							45,394
Other comprehensive income (loss), net of tax	30,432						30,432
Issuance of common stock through employee stock purchase plan (in shares)			18,000
Issuance of common stock through employee stock purchase plan	1,127				1,127
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes (in shares)			137,000	15,000
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes	(2,541)		$ 1	$ 680	(3,222)
Share-based compensation	6,098				6,098
Balance End of Period, Shares (in shares) at Mar. 31, 2021			89,406,000
Balance, End of Period at Mar. 31, 2021	1,529,331		$ 894	$ (234,461)	1,231,638		(43,627)	574,887
Balance, End of Period, Treasury Stock, Shares (in shares) at Mar. 31, 2021				(4,899,000)
Balance Beginning of Period, Shares (in shares) at Dec. 31, 2020			89,251,000
Balance, Beginning of Period at Dec. 31, 2020	$ 1,514,867	$ (66,046)	$ 893	$ (235,141)	1,290,909	$ (63,274)	(74,059)	532,265	$ (2,772)
Balance, Beginning of Period, Treasury Stock, Shares (in shares) at Dec. 31, 2020	(4,914,000)			(4,914,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 123,691
Other comprehensive income (loss), net of tax	27,285
Balance End of Period, Shares (in shares) at Sep. 30, 2021			89,597,000
Balance, End of Period at Sep. 30, 2021	$ 1,631,687		$ 896	$ (234,449)	1,258,830		(46,774)	653,184
Balance, End of Period, Treasury Stock, Shares (in shares) at Sep. 30, 2021	(4,899,000)			(4,899,000)
Balance Beginning of Period, Shares (in shares) at Mar. 31, 2021			89,406,000
Balance, Beginning of Period at Mar. 31, 2021	$ 1,529,331		$ 894	$ (234,461)	1,231,638		(43,627)	574,887
Balance, Beginning of Period, Treasury Stock, Shares (in shares) at Mar. 31, 2021				(4,899,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	35,068							35,068
Other comprehensive income (loss), net of tax	(6,336)						(6,336)
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes (in shares)			68,000
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes	1,176		$ 1	$ 0	1,175
Share-based compensation	15,742				15,742
Balance End of Period, Shares (in shares) at Jun. 30, 2021			89,474,000
Balance, End of Period at Jun. 30, 2021	1,574,981		$ 895	$ (234,461)	1,248,555		(49,963)	609,955
Balance, End of Period, Treasury Stock, Shares (in shares) at Jun. 30, 2021				(4,899,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	43,229							43,229
Other comprehensive income (loss), net of tax	3,189						3,189
Treasury shares retirement	0			$ 12	(12)
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes (in shares)			123,000
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes	2,542		$ 1	0	2,541
Share-based compensation	7,746				7,746
Balance End of Period, Shares (in shares) at Sep. 30, 2021			89,597,000
Balance, End of Period at Sep. 30, 2021	$ 1,631,687		$ 896	$ (234,449)	$ 1,258,830		$ (46,774)	$ 653,184
Balance, End of Period, Treasury Stock, Shares (in shares) at Sep. 30, 2021	(4,899,000)			(4,899,000)