CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDER'S EQUITY - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings
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	32,756					32,756
Other comprehensive 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, 2019		88,735,000
Balance, Beginning of Period at Dec. 31, 2019	$ 1,416,736	$ 887	$ (119,943)	1,213,620	(76,401)	398,573
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	$ 9,180					9,180
Other comprehensive 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)	(1,400,000)		(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	$ (104,588)	$ 407,553
Balance, End of Period, Treasury Stock, Shares (in shares) at Mar. 31, 2020	(4,294,000)		(4,294,000)