CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDER'S EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment
Balance Beginning of Period, Shares (in shares) at Dec. 31, 2018			88,044,000
Balance, Beginning of Period at Dec. 31, 2018	$ 1,375,796		$ 880	$ (120,615)	$ 1,192,601	$ (45,443)	$ 348,373
Balance, Beginning of Period, Treasury Stock, Shares (in shares) at Dec. 31, 2018				(2,881,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	32,756						32,756
Other comprehensive income (loss), net of tax	(11,236)					(11,236)
Issuance of common stock through employee stock purchase plan (in shares)			17,000
Issuance of common stock through employee stock purchase plan	716				716
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes (in shares)			243,000	12,000
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes	(5,121)		$ 2	$ 506	(5,629)
Share-based compensation	4,119				4,119
Balance End of Period, Shares (in shares) at Mar. 31, 2019			88,304,000
Balance, End of Period at Mar. 31, 2019	1,397,030		$ 882	$ (120,109)	1,191,807	(56,679)	381,129
Balance, End of Period, Treasury Stock, Shares (in shares) at Mar. 31, 2019				(2,869,000)
Balance Beginning of Period, Shares (in shares) at Dec. 31, 2018			88,044,000
Balance, Beginning of Period at Dec. 31, 2018	1,375,796		$ 880	$ (120,615)	1,192,601	(45,443)	348,373
Balance, Beginning of Period, Treasury Stock, Shares (in shares) at Dec. 31, 2018				(2,881,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	34,882
Balance End of Period, Shares (in shares) at Sep. 30, 2019			88,689,000
Balance, End of Period at Sep. 30, 2019	1,384,974		$ 886	$ (120,101)	1,208,549	(87,615)	383,255
Balance, End of Period, Treasury Stock, Shares (in shares) at Sep. 30, 2019				(2,869,000)
Balance Beginning of Period, Shares (in shares) at Mar. 31, 2019			88,304,000
Balance, Beginning of Period at Mar. 31, 2019	1,397,030		$ 882	$ (120,109)	1,191,807	(56,679)	381,129
Balance, Beginning of Period, Treasury Stock, Shares (in shares) at Mar. 31, 2019				(2,869,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	29,736						29,736
Other comprehensive income (loss), net of tax	(12,021)					(12,021)
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes (in shares)			47,000
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes	408		$ 1	$ 2	405
Share-based compensation	5,798				5,798
Balance End of Period, Shares (in shares) at Jun. 30, 2019			88,351,000
Balance, End of Period at Jun. 30, 2019	1,420,951		$ 883	$ (120,107)	1,198,010	(68,700)	410,865
Balance, End of Period, Treasury Stock, Shares (in shares) at Jun. 30, 2019				(2,869,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(27,610)						(27,610)
Other comprehensive income (loss), net of tax	(18,915)					(18,915)
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes (in shares)			338,000
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes	4,674		$ 3	$ 6	4,665
Share-based compensation	5,874				5,874
Balance End of Period, Shares (in shares) at Sep. 30, 2019			88,689,000
Balance, End of Period at Sep. 30, 2019	1,384,974		$ 886	$ (120,101)	1,208,549	(87,615)	383,255
Balance, End of Period, Treasury Stock, Shares (in shares) at Sep. 30, 2019				(2,869,000)
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)			(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	1,341,802		$ 889	$ (202,506)	1,240,455	(104,589)	407,553
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)			(2,865,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 41,148
Other comprehensive income (loss), net of tax	$ (15,511)
Accelerated shares repurchased (in shares)	(2,100,000)
Balance End of Period, Shares (in shares) at Sep. 30, 2020			89,191,000
Balance, End of Period at Sep. 30, 2020	$ 1,397,987		$ 892	$ (235,224)	1,284,711	(91,913)	439,521
Balance, End of Period, Treasury Stock, Shares (in shares) at Sep. 30, 2020	(4,915,000)			(4,915,000)
Balance Beginning of Period, Shares (in shares) at Mar. 31, 2020			89,105,000
Balance, Beginning of Period at Mar. 31, 2020	$ 1,341,802		$ 889	$ (202,506)	1,240,455	(104,589)	407,553
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	1,349,095		$ 892	$ (235,226)	1,279,370	(103,125)	407,184
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)			$ 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	$ 1,397,987		$ 892	$ (235,224)	$ 1,284,711	$ (91,913)	$ 439,521
Balance, End of Period, Treasury Stock, Shares (in shares) at Sep. 30, 2020	(4,915,000)			(4,915,000)