CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands		Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income		348,708				337,984	10,724
Common stock dividends declared		(93,611)				(93,611)
Common stock issued under employee stock option and stock purchase plans and other (in shares)	[1],[2]			696,524
Common stock issued under employee stock award/option and stock purchase plans and other	[1],[2]	23,650		$ 348	23,302
Common stock repurchases (in shares)				(735,294)
Common stock repurchases		(56,652)		$ (368)	(15,188)	(41,096)
Share-based compensation		35,999			35,999
Ending balance at Sep. 30, 2021		2,513,651	0	$ 26,846	1,177,067	2,116,219	(806,481)
Ending balance (in shares) at Sep. 30, 2021				53,693,263
Beginning balance at Jun. 30, 2021		2,418,214	0	$ 26,886	1,163,267	2,015,743	(787,682)
Beginning balance (in shares) at Jun. 30, 2021				53,773,599
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income		119,255				138,054	(18,799)
Common stock dividends declared		(31,947)				(31,947)
Common stock issued under employee stock option and stock purchase plans and other (in shares)	[3],[4]			16,957
Common stock issued under employee stock award/option and stock purchase plans and other	[3],[4]	3,098		$ 9	3,089
Common stock repurchases (in shares)				(97,293)
Common stock repurchases		(7,674)		$ (49)	(1,994)	(5,631)
Share-based compensation		12,705			12,705
Ending balance at Sep. 30, 2021		2,513,651	0	$ 26,846	1,177,067	2,116,219	(806,481)
Ending balance (in shares) at Sep. 30, 2021				53,693,263
Beginning balance at Dec. 31, 2021		$ 2,797,946	0	$ 26,896	1,194,334	2,265,957	(689,241)
Beginning balance (in shares) at Dec. 31, 2021		53,789,036		53,789,036
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income		$ 578,230				660,982	(82,752)
Common stock dividends declared		(93,076)				(93,076)
Common stock purchased under employee stock option and stock purchase plans and other (in shares)	[1],[2]			490,286
Common stock purchased under employee stock option and stock purchase plans and other	[1],[2]	(6,029)		$ 245	(6,274)
Common stock repurchases (in shares)				(4,028,230)
Common stock repurchases		(300,280)		$ (2,015)	4,989	(303,254)
Share-based compensation		33,970			33,970
Ending balance at Sep. 30, 2022		$ 3,010,761	0	$ 25,126	1,227,019	2,530,609	(771,993)
Ending balance (in shares) at Sep. 30, 2022		50,251,092		50,251,092
Beginning balance at Jun. 30, 2022		$ 2,832,560	0	$ 25,597	1,148,835	2,379,800	(721,672)
Beginning balance (in shares) at Jun. 30, 2022				51,194,660
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income		195,674				245,995	(50,321)
Common stock dividends declared		(31,927)				(31,927)
Common stock issued under employee stock option and stock purchase plans and other (in shares)	[3],[4]			32,392
Common stock issued under employee stock award/option and stock purchase plans and other	[3],[4]	2,998		$ 16	2,982
Common stock repurchases (in shares)				(975,960)
Common stock repurchases		0		$ (487)	63,746	(63,259)
Share-based compensation		11,456			11,456
Ending balance at Sep. 30, 2022		$ 3,010,761	$ 0	$ 25,126	$ 1,227,019	$ 2,530,609	$ (771,993)
Ending balance (in shares) at Sep. 30, 2022		50,251,092		50,251,092

[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

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

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