Consolidated Statements Of Changes In Equity (USD $) In Thousands	Total	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Non-Controlling Interest [Member]
Balance at Dec. 31, 2011	$ 2,170,361	$ 446,387	$ 1,042,065	$ 575,419	$ (8,362)	$ 110,538	$ 4,314
Net income	204,836			202,538			2,298
Other comprehensive income	55,502					55,502
Distributions to non-controlling interest	(1,976)						(1,976)
Purchase of treasury stock	(75,536)				(75,536)
Issuance of stock under purchase and equity compensation plans	9,766		(4,987)		14,753
Net tax benefit related to equity compensation plans	1,233		1,233
Stock-based compensation	3,705		3,705
Issuance of nonvested stock awards	0		(8,501)		8,501
Cash dividends	(60,819)			(60,819)
Balance at Sep. 30, 2012	2,307,072	446,387	1,033,515	717,138	(60,644)	166,040	4,636
Balance at Dec. 31, 2012	2,171,574	458,646	1,102,507	477,210	(7,580)	136,344	4,447
Net income	195,292			195,046			246
Other comprehensive income	(110,319)					(110,319)
Distributions to non-controlling interest	(740)						(740)
Stock Issued During Period, Value, New Issues	43,197	1,001	11,125		31,071
Purchase of treasury stock	(69,195)				(69,195)
Issuance of stock under purchase and equity compensation plans	8,154		(3,957)		12,111
Net tax benefit related to equity compensation plans	454		454
Stock-based compensation	4,605		4,605
Issuance of nonvested stock awards	0		(10,065)		10,065
Cash dividends	(61,536)			(61,536)
Balance at Sep. 30, 2013	$ 2,181,486	$ 459,647	$ 1,104,669	$ 610,720	$ (23,528)	$ 26,025	$ 3,953