Parentheticals Balance Sheet and Stockholders Equity (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Common Stock, Shares, Outstanding	227,056,000	226,162,000	181,086,000
Dividends Paid Per Share	$ 0.425	$ 0.400	$ 0.400
Preferred Stock [Member]
Preferred Stock, authorized	15,000,000	15,000,000
Preferred Stock, issued	0	0
Preferred Stock, outstanding	0	0
Common Stock [Member]
Common Stock, Par Value	$ 0.01	$ 0.01
Common Stock, Shares Authorized	500,000,000	500,000,000
Common Stock, Issued	227,289,426	227,289,426
Common Stock, Shares, Outstanding	227,056,212	226,162,133
Common Stock in Treasury, Shares	233,214	1,127,293
Dividends Paid Per Share	$ 0.425	$ 0.400	$ 0.400
Treasury Rate Lock [Member]
Tax related to treasury rate lock	$ 59	$ 49	$ 49
Cash Flow Hedging [Member]
Tax related to treasury rate lock	68,310	15,983	34,932
Adjustment For Actuarially Determined Liabilities [Member]
Tax related to treasury rate lock	$ 1,583	$ 154,773	$ 109,145