CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands		Total	Cumulative Effect, Period of Adoption, Adjustment	Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2019		$ 2,476,310	$ (5,077)	$ 0	$ 26,639	$ 1,108,649	$ 2,177,513	$ (5,077)	$ (836,491)
Beginning balance (in shares) at Dec. 31, 2019					53,278,316
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)		(188,067)					(109,613)		(78,454)
Common stock dividends declared		(30,379)					(30,379)
Common stock issued under employee stock award and stock purchase plans (in shares)	[1],[2]				760,746
Common stock issued under employee stock award and stock purchase plans	[1],[2]	(1,218)			$ 380	(1,598)
Common stock repurchases (in shares)					(303,098)
Common stock repurchases		(11,924)			$ (152)	(6,214)	(5,558)
Share-based compensation		3,091				3,091
Ending balance at Mar. 31, 2020		2,242,736		0	$ 26,867	1,103,928	2,026,886		(914,945)
Ending balance (in shares) at Mar. 31, 2020					53,735,964
Beginning balance at Dec. 31, 2020		$ 2,255,557		0	$ 26,866	1,132,954	1,912,942		(817,205)
Beginning balance (in shares) at Dec. 31, 2020		53,732,033			53,732,033
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)		$ 65,263					50,825		14,438
Common stock dividends declared		(30,569)					(30,569)
Common stock issued under employee stock award and stock purchase plans (in shares)	[1],[2]				426,311
Common stock issued under employee stock award and stock purchase plans	[1],[2]	(1,797)			$ 213	(2,010)
Common stock repurchases (in shares)					(287,957)
Common stock repurchases		(19,444)			$ (144)	(5,977)	(13,323)
Share-based compensation		10,677				10,677
Ending balance at Mar. 31, 2021		$ 2,279,687		$ 0	$ 26,935	$ 1,135,644	$ 1,919,875		$ (802,767)
Ending balance (in shares) at Mar. 31, 2021		53,870,387			53,870,387

[1] Net of common shares delivered as payment for the exercise price or to satisfy the holders’ withholding tax liability upon exercise of options.

[2] Represents open-market transactions of common shares by the trustee of our deferred compensation plans.