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/(loss)	(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 income	(29,138)						(29,138)
Ending balance, shares at Jun. 30, 2019			80,133
Ending balance at Jun. 30, 2019	953,492		$ 1	146,887	971,490		(164,886)
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 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 income/(loss)	(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 income	(22,125)						(22,125)
Ending balance, shares at Jun. 30, 2019			80,133
Ending balance at Jun. 30, 2019	$ 953,492		$ 1	146,887	971,490		(164,886)
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/(loss)	92,824				92,824
Shares issued in connection with share-based compensation, shares			687
Shares issued in connection with share-based compensation	5,785			5,785
Payment of tax withholdings related to net share settlements	(9,346)			(9,346)
Share-based compensation	21,838			21,838
Shares repurchased and retired, shares			(200)
Shares repurchased and retired	(9,273)			(9,273)
Dividends on common shares	(17,464)			25	(17,489)
Other comprehensive income	$ (50,278)						(50,278)
Ending balance, shares at Jun. 30, 2020	79,459		79,459
Ending balance at Jun. 30, 2020	$ 1,002,123		$ 1	120,029	1,099,154		(217,061)
Beginning balance, shares at Mar. 31, 2020			79,411
Beginning balance at Mar. 31, 2020	926,998		$ 1	111,481	1,057,692		(242,176)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income/(loss)	59,005				59,005
Shares issued in connection with share-based compensation, shares			198
Shares issued in connection with share-based compensation	2,853			2,853
Payment of tax withholdings related to net share settlements	(1,295)			(1,295)
Share-based compensation	13,753			13,753
Shares repurchased and retired, shares			(150)
Shares repurchased and retired	(6,842)			(6,842)
Dividends on common shares	(17,464)			79	(17,543)
Other comprehensive income	$ 25,115						25,115
Ending balance, shares at Jun. 30, 2020	79,459		79,459
Ending balance at Jun. 30, 2020	$ 1,002,123		$ 1	$ 120,029	$ 1,099,154		$ (217,061)