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, 2010	$ 2,023,464	$ 433,942	$ 971,293	$ 555,778	$ (2,371)	$ 63,345	$ 1,477
Net income	196,576			194,839			1,737
Other comprehensive income	52,436					52,436
Distributions to non-controlling interest	(463)						(463)
Purchase of treasury stock	(101,111)				(101,111)
Issuance of stock under purchase and equity compensation plans	14,060	1,563	5,261		7,236
Net tax benefit related to equity compensation plans	1,025		1,025
Stock-based compensation	3,614		3,614
Issuance of nonvested stock awards	0	976	(1,017)		41
Cash dividends	(59,636)			(59,636)
Balance at Sep. 30, 2011	2,129,965	436,481	980,176	690,981	(96,205)	115,781	2,751
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