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 income	109,254			109,254
Shares issued in connection with share-based compensation, shares		1,428
Shares issued in connection with share-based compensation	19,585		19,585
Payment of tax withholdings related to net share settlements	(12,623)		(12,623)
Share-based compensation	29,574		29,574
Shares repurchased and retired, shares		(1,751)
Shares repurchased and retired	(87,028)		(87,028)
Other comprehensive loss	(13,330)				(13,330)
Ending balance, shares at Sep. 30, 2018		80,562
Ending balance at Sep. 30, 2018	1,030,116	$ 1	173,963	962,765	(106,613)
Beginning balance, shares at Jun. 30, 2018		80,944
Beginning balance at Jun. 30, 2018	1,024,239	$ 1	186,816	940,314	(102,892)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	22,451			22,451
Shares issued in connection with share-based compensation, shares		97
Shares issued in connection with share-based compensation	2,019		2,019
Payment of tax withholdings related to net share settlements	(941)		(941)
Share-based compensation	9,775		9,775
Shares repurchased and retired, shares		(479)
Shares repurchased and retired	(23,706)		(23,706)
Other comprehensive loss	(3,721)				(3,721)
Ending balance, shares at Sep. 30, 2018		80,562
Ending balance at Sep. 30, 2018	$ 1,030,116	$ 1	173,963	962,765	(106,613)
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 income	19,298			19,298
Shares issued in connection with share-based compensation, shares		827
Shares issued in connection with share-based compensation	8,391		8,391
Payment of tax withholdings related to net share settlements	(9,645)		(9,645)
Share-based compensation	26,863		26,863
Shares repurchased and retired, shares		(1,400)
Shares repurchased and retired	(61,607)		(61,607)
Other comprehensive loss	$ (50,937)				(50,937)
Ending balance, shares at Sep. 30, 2019	79,519	79,519
Ending balance at Sep. 30, 2019	$ 932,861	$ 1	124,872	994,673	(186,685)
Beginning balance, shares at Jun. 30, 2019		80,133
Beginning balance at Jun. 30, 2019	953,492	$ 1	146,887	971,490	(164,886)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	23,183			23,183
Shares issued in connection with share-based compensation, shares		86
Shares issued in connection with share-based compensation	1,832		1,832
Payment of tax withholdings related to net share settlements	(378)		(378)
Share-based compensation	9,108		9,108
Shares repurchased and retired, shares		(700)
Shares repurchased and retired	(32,577)		(32,577)
Other comprehensive loss	$ (21,799)				(21,799)
Ending balance, shares at Sep. 30, 2019	79,519	79,519
Ending balance at Sep. 30, 2019	$ 932,861	$ 1	$ 124,872	$ 994,673	$ (186,685)