Condensed Consolidated Statement of Stockholder's Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss
Beginning balance, shares at Dec. 31, 2018			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 income	(50,937)						(50,937)
Ending balance, shares at Sep. 30, 2019			79,519
Ending balance at Sep. 30, 2019	932,861		$ 1	124,872	994,673		(186,685)
Beginning balance, shares at Dec. 31, 2018			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]
Dividends on common shares	$ (400)
Ending balance, shares at Dec. 31, 2019	78,972
Ending balance at Dec. 31, 2019	$ 951,210	$ 16,827	$ 1	111,000	1,006,992	$ 16,827	(166,783)
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 income	(21,799)						(21,799)
Ending balance, shares at Sep. 30, 2019			79,519
Ending balance at Sep. 30, 2019	$ 932,861		$ 1	124,872	994,673		(186,685)
Beginning balance, shares at Dec. 31, 2019	78,972
Beginning balance at Dec. 31, 2019	$ 951,210	$ 16,827	$ 1	111,000	1,006,992	$ 16,827	(166,783)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	205,969				205,969
Shares issued in connection with share-based compensation, shares			773
Shares issued in connection with share-based compensation	8,487			8,487
Payment of tax withholdings related to net share settlements	(9,816)			(9,816)
Share-based compensation	34,671			34,671
Shares repurchased and retired, shares			(200)
Shares repurchased and retired	(9,273)			(9,273)
Dividends on common shares	(43,686)			198	(43,884)
Other comprehensive income	$ (31,650)						(31,650)
Ending balance, shares at Sep. 30, 2020	79,545		79,545
Ending balance at Sep. 30, 2020	$ 1,122,739		$ 1	135,267	1,185,904		(198,433)
Beginning balance, shares at Jun. 30, 2020			79,459
Beginning balance at Jun. 30, 2020	1,002,123		$ 1	120,029	1,099,154		(217,061)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	113,146				113,146
Shares issued in connection with share-based compensation, shares			86
Shares issued in connection with share-based compensation	2,702			2,702
Payment of tax withholdings related to net share settlements	(470)			(470)
Share-based compensation	12,833			12,833
Shares repurchased and retired, shares			0
Shares repurchased and retired	0			0
Dividends on common shares	(26,223)			173	(26,396)
Other comprehensive income	$ 18,628						18,628
Ending balance, shares at Sep. 30, 2020	79,545		79,545
Ending balance at Sep. 30, 2020	$ 1,122,739		$ 1	$ 135,267	$ 1,185,904		$ (198,433)