Consolidated Statements of Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Retained Earnings [Member]	Total Parent Equity [Member]	Non-Controlling Interest in Subsidiaries [Member]
Beginning Balance at Dec. 31, 2010	$ 2,763,486	$ 157,636		$ (298,352)	$ 2,895,307	$ 2,754,591	$ 8,895
Beginning Balance, Shares at Dec. 31, 2010		157,636,261
Net income	565,116				565,116	565,116
Other comprehensive income (loss), net of tax	(183,686)			(183,686)		(183,686)
Cash dividends declared	(281,790)				(281,790)	(281,790)
Stock options exercised, including tax benefit	4,307	443	3,864			4,307
Stock options exercised, including tax benefit, Shares		443,170
Share-based compensation	7,547		7,547			7,547
Purchase of stock	(122,078)	(2,428)	(11,411)		(108,239)	(122,078)
Purchase of stock, Shares		(2,428,315)
Noncontrolling interest activities	689						689
Ending Balance at Dec. 31, 2011	2,753,591	155,651		(482,038)	3,070,394	2,744,007	9,584
Ending Balance, Shares at Dec. 31, 2011		155,651,116
Net income	648,041				648,041	648,041
Other comprehensive income (loss), net of tax	(19,454)			(19,454)		(19,454)
Cash dividends declared	(307,603)				(307,603)	(307,603)
Stock options exercised, including tax benefit	3,975	552	3,423			3,975
Stock options exercised, including tax benefit, Shares		551,779
Share-based compensation	10,747		10,747			10,747
Purchase of stock	(81,826)	(1,362)	(14,170)		(66,294)	(81,826)
Purchase of stock, Shares		(1,361,457)
Noncontrolling interest activities	708						708
Ending Balance at Dec. 31, 2012	3,008,179	154,841		(501,492)	3,344,538	2,997,887	10,292
Ending Balance, Shares at Dec. 31, 2012		154,841,438
Net income	684,959				684,959	684,959
Other comprehensive income (loss), net of tax	103,837			103,837		103,837
Cash dividends declared	(332,322)				(332,322)	(332,322)
Stock options exercised, including tax benefit	2,737	450	2,287			2,737
Stock options exercised, including tax benefit, Shares	1,335,000	449,986
Share-based compensation	12,648		12,648			12,648
Purchase of stock	(120,672)	(1,518)			(119,154)	(120,672)
Purchase of stock, Shares		(1,518,326)
Noncontrolling interest activities	(598)						(598)
Ending Balance at Dec. 31, 2013	$ 3,358,768	$ 153,773	$ 14,935	$ (397,655)	$ 3,578,021	$ 3,349,074	$ 9,694
Ending Balance, Shares at Dec. 31, 2013		153,773,098