CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 31, 2011	$ 256,997	$ 4,773,383	$ 226,721	$ (386,963)	$ (415,001)	$ 13,997	$ 4,469,134
Balance (in shares) at Dec. 31, 2011	1,027,986				(32,858)
Stock plans	0	(44,045)	0	0	44,985	0	940
Stock plans (in shares)					3,384
Dividends on common stock	0	0	(99,851)	0	0	0	(99,851)
Net income	0	0	26,768	0	0	3,722	30,490
Other comprehensive income, net of tax	0	0	0	4,267	0	0	4,267
Distributions	0	0	0	0	0	(5,000)	(5,000)
Balance at Mar. 31, 2012	256,997	4,729,338	153,638	(382,696)	(370,016)	12,719	4,399,980
Balance (in shares) at Mar. 31, 2012	1,027,986				(29,474)
Stock plans	0	9,463	0	0	1,423	0	10,886
Stock plans (in shares)					(102)
Dividends on common stock	0	(99,238)	(200,301)	0	0	0	(299,539)
Net income	0	0	109,868	0	0	12,956	122,824
Other comprehensive income, net of tax	0	0	0	(100,880)	0	0	(100,880)
Distributions	0	0	0	0	0	(14,000)	(14,000)
Balance at Dec. 31, 2012	256,997	4,639,563	63,205	(483,576)	(368,593)	11,675	4,119,271
Balance (in shares) at Dec. 31, 2012	1,027,986				(29,576)		998,410,000
Stock plans	0	(3,094)	0	0	2,888	0	(206)
Stock plans (in shares)					(279)
Dividends on common stock	0	(99,812)	0	0	0	0	(99,812)
Net income	0	0	48,140	0	0	2,643	50,783
Other comprehensive income, net of tax	0	0	0	6,746	0	0	6,746
Distributions	0	0	0	0	0	(6,400)	(6,400)
Balance at Mar. 31, 2013	$ 256,997	$ 4,536,657	$ 111,345	$ (476,830)	$ (365,705)	$ 7,918	$ 4,070,382
Balance (in shares) at Mar. 31, 2013	1,027,986				(29,855)		998,131,000