Consolidated Statements Of Changes In Equity (USD $) In Thousands	Total	Common Stock	Capital Surplus	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Non-Controlling Interest
Balance at Dec. 31, 2009	$ 1,885,905	$ 415,637	$ 854,490	$ 568,532	$ (838)	$ 46,407	$ 1,677
Net income	221,875			221,710			165
Other comprehensive income	16,938					16,938
Distributions to non-controlling interest	(365)						(365)
Purchase of treasury stock	(40,984)				(40,984)
Cash dividends paid	(78,231)			(78,231)
Net tax benefit related to equity compensation plans	1,178		1,178
Stock-based compensation	6,021		6,021
Issuance under stock purchase and equity compensation plans, net	11,310	2,196	3,102		6,012
5% stock dividend, net	(183)	16,109	106,502	(156,233)	33,439
Balance at Dec. 31, 2010	2,023,464	433,942	971,293	555,778	(2,371)	63,345	1,477
Net income	259,623			256,343			3,280
Other comprehensive income	47,193					47,193
Distributions to non-controlling interest	(443)						(443)
Purchase of treasury stock	(101,154)				(101,154)
Cash dividends paid	(79,140)			(79,140)
Net tax benefit related to equity compensation plans	1,065		1,065
Stock-based compensation	4,731		4,731
Issuance under stock purchase and equity compensation plans, net	15,349	2,539	4,061		8,749
5% stock dividend, net	(327)	9,906	60,915	(157,562)	86,414
Balance at Dec. 31, 2011	2,170,361	446,387	1,042,065	575,419	(8,362)	110,538	4,314
Net income	271,439			269,329			2,110
Other comprehensive income	25,806					25,806
Distributions to non-controlling interest	(1,977)						(1,977)
Purchase of treasury stock	(104,909)				(104,909)
Cash dividends paid	(211,608)			(211,608)
Net tax benefit related to equity compensation plans	2,094		2,094
Stock-based compensation	5,001		5,001
Issuance under stock purchase and equity compensation plans, net	15,588		(16,905)		32,493
5% stock dividend, net	(221)	12,259	70,252	(155,930)	73,198
Balance at Dec. 31, 2012	$ 2,171,574	$ 458,646	$ 1,102,507	$ 477,210	$ (7,580)	$ 136,344	$ 4,447