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	1,027,986,000				(32,858,000)
Stock plans	0	(40,990)	0	0	45,859	0	4,869
Stock plans (in shares)	0				3,373,000
Dividends on common stock		0	(199,702)	0		0	(199,702)
Net income		0	44,757	0		7,732	52,489
Other comprehensive income, net of tax		0	0	9,834		0	9,834
Distributions		0	0	0		(5,000)	(5,000)
Balance at Jun. 30, 2012	256,997	4,732,393	71,776	(377,129)	(369,142)	16,729	4,331,624
Balance (in shares) at Jun. 30, 2012	1,027,986,000				(29,485,000)
Stock plans	0	6,408	0	0	549	0	6,957
Stock plans (in shares)	0				(91,000)
Dividends on common stock		(99,238)	(100,450)	0		0	(199,688)
Net income		0	91,879	0		8,946	100,825
Other comprehensive income, net of tax		0	0	(106,447)		0	(106,447)
Distributions		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	1,027,986,000				(29,576,000)		998,410,000
Stock plans	0	(31,045)	0	0	35,148	0	4,103
Stock plans (in shares)	0				2,113,000
Dividends on common stock		(199,866)	0	0		0	(199,866)
Net income		0	9,680	0		2,643	12,323
Other comprehensive income, net of tax		0	0	13,492		0	13,492
Distributions		0	0	0		(6,400)	(6,400)
Sale of Mohave partnership interest		0	0	0		(7,918)	(7,918)
Balance at Jun. 30, 2013	$ 256,997	$ 4,408,652	$ 72,885	$ (470,084)	$ (333,445)	$ 0	$ 3,935,005
Balance (in shares) at Jun. 30, 2013	1,027,986,000				(27,463,000)		1,000,523,000