Condensed Consolidated Statement of Stockholder's Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance, shares at Dec. 31, 2017		80,885
Beginning balance at Dec. 31, 2017	$ 1,007,876	$ 1	$ 224,455	$ 877,111	$ (93,691)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting standards	(23,192)			(23,600)	408
Net (loss)/income	86,803			86,803
Shares issued in connection with share-based compensation, shares		1,331
Shares issued in connection with share-based compensation	17,566		17,566
Payment of tax withholdings related to net share settlements	(11,682)		(11,682)
Share-based compensation	19,799		19,799
Shares repurchased and retired, shares		(1,272)
Shares repurchased and retired	(63,322)		(63,322)
Other comprehensive loss	(9,609)				(9,609)
Ending balance, shares at Jun. 30, 2018		80,944
Ending balance at Jun. 30, 2018	1,024,239	$ 1	186,816	940,314	(102,892)
Beginning balance, shares at Mar. 31, 2018		81,636
Beginning balance at Mar. 31, 2018	1,008,009	$ 1	219,594	881,798	(93,384)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss)/income	58,516			58,516
Shares issued in connection with share-based compensation, shares		180
Shares issued in connection with share-based compensation	2,093		2,093
Payment of tax withholdings related to net share settlements	(1,150)		(1,150)
Share-based compensation	11,122		11,122
Shares repurchased and retired, shares		(872)
Shares repurchased and retired	(44,843)		(44,843)
Other comprehensive loss	(9,508)				(9,508)
Ending balance, shares at Jun. 30, 2018		80,944
Ending balance at Jun. 30, 2018	$ 1,024,239	$ 1	186,816	940,314	(102,892)
Beginning balance, shares at Dec. 31, 2018	80,092	80,092
Beginning balance at Dec. 31, 2018	$ 1,000,498	$ 1	160,870	975,375	(135,748)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss)/income	(3,885)			(3,885)
Shares issued in connection with share-based compensation, shares		741
Shares issued in connection with share-based compensation	6,559		6,559
Payment of tax withholdings related to net share settlements	(9,267)		(9,267)
Share-based compensation	17,755		17,755
Shares repurchased and retired, shares		(700)
Shares repurchased and retired	(29,030)		(29,030)
Other comprehensive loss	$ (29,138)				(29,138)
Ending balance, shares at Jun. 30, 2019	80,133	80,133
Ending balance at Jun. 30, 2019	$ 953,492	$ 1	146,887	971,490	(164,886)
Beginning balance, shares at Mar. 31, 2019		80,633
Beginning balance at Mar. 31, 2019	999,271	$ 1	164,969	977,062	(142,761)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss)/income	(5,572)			(5,572)
Shares issued in connection with share-based compensation, shares		200
Shares issued in connection with share-based compensation	3,801		3,801
Payment of tax withholdings related to net share settlements	(716)		(716)
Share-based compensation	7,863		7,863
Shares repurchased and retired, shares		(700)
Shares repurchased and retired	(29,030)		(29,030)
Other comprehensive loss	$ (22,125)				(22,125)
Ending balance, shares at Jun. 30, 2019	80,133	80,133
Ending balance at Jun. 30, 2019	$ 953,492	$ 1	$ 146,887	$ 971,490	$ (164,886)