Consolidated Statements Of Equity (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, 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
Stock plans		(3,094)			2,888		(206)
Stock plans (in shares)					(279,000)
Dividends on common stock		(99,812)					(99,812)
Net income			48,140			2,643	50,783
Other comprehensive income, net of tax				6,746			6,746
Distributions						(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	1,027,986,000				29,855,000
Stock plans		(15,577)			27,555		11,978
Stock plans (in shares)					1,331,000
Dividends on common stock		(200,024)	(99,932)				(299,956)
Net income			64,695				64,695
Pension settlement costs, net of tax				27,381			27,381
Other comprehensive income, net of tax				188,919			188,919
Sale of Mohave partnership interest						(7,918)	(7,918)
Balance at Dec. 31, 2013	256,997	4,321,056	76,108	(260,530)	(338,150)		4,055,481
Balance (in shares) at Dec. 31, 2013	1,027,986,000				28,524,000		999,462,000
Stock plans		(39,345)			39,451		106
Stock plans (in shares)					2,819,000
Dividends on common stock		(100,228)					(100,228)
Net income			39,274				39,274
Other comprehensive income, net of tax				3,039			3,039
Balance at Mar. 31, 2014	$ 256,997	$ 4,181,483	$ 115,382	$ (257,491)	$ (298,699)		$ 3,997,672
Balance (in shares) at Mar. 31, 2014	1,027,986,000				25,705,000		1,002,281,000