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)	(251,861)					(183,712)		(68,149)
Common stock dividends declared	(60,226)					(60,226)
Common stock issued under employee stock award and stock purchase plans and other (in shares)				843,623
Common stock issued under employee stock award and stock purchase plans and other	1,240			$ 422	818
Common stock repurchases (in shares)				(303,098)
Common stock repurchases	(11,924)			$ (152)	(6,214)	(5,558)
Share-based compensation	10,630				10,630
Ending balance at Jun. 30, 2020	2,159,092		0	$ 26,909	1,113,883	1,922,940		(904,640)
Ending balance (in shares) at Jun. 30, 2020				53,818,841
Beginning balance at Mar. 31, 2020	2,242,736		0	$ 26,867	1,103,928	2,026,886		(914,945)
Beginning balance (in shares) at Mar. 31, 2020				53,735,964
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	(63,794)					(74,099)		10,305
Common stock dividends declared	(29,847)					(29,847)
Common stock issued under employee stock award and stock purchase plans and other (in shares)				82,877
Common stock issued under employee stock award and stock purchase plans and other	2,458			$ 42	2,416
Share-based compensation	7,539				7,539
Ending balance at Jun. 30, 2020	2,159,092		0	$ 26,909	1,113,883	1,922,940		(904,640)
Ending balance (in shares) at Jun. 30, 2020				53,818,841
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)	$ 229,453					199,930		29,523
Common stock dividends declared	(61,664)					(61,664)
Common stock issued under employee stock award and stock purchase plans and other (in shares)				679,567
Common stock issued under employee stock award and stock purchase plans and other	20,552			$ 339	20,213
Common stock repurchases (in shares)				(638,001)
Common stock repurchases	(48,978)			$ (319)	(13,194)	(35,465)
Share-based compensation	23,294				23,294
Ending balance at Jun. 30, 2021	$ 2,418,214		0	$ 26,886	1,163,267	2,015,743		(787,682)
Ending balance (in shares) at Jun. 30, 2021	53,773,599			53,773,599
Beginning balance at Mar. 31, 2021	$ 2,279,687		0	$ 26,935	1,135,644	1,919,875		(802,767)
Beginning balance (in shares) at Mar. 31, 2021				53,870,387
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	164,190					149,105		15,085
Common stock dividends declared	(31,095)					(31,095)
Common stock issued under employee stock award and stock purchase plans and other (in shares)				253,256
Common stock issued under employee stock award and stock purchase plans and other	22,349			$ 126	22,223
Common stock repurchases (in shares)				(350,044)
Common stock repurchases	(29,534)			$ (175)	(7,217)	(22,142)
Share-based compensation	12,617				12,617
Ending balance at Jun. 30, 2021	$ 2,418,214		$ 0	$ 26,886	$ 1,163,267	$ 2,015,743		$ (787,682)
Ending balance (in shares) at Jun. 30, 2021	53,773,599			53,773,599