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Earnings Per Share - Calculation of Weighted Average Common Shares Outstanding used in Computation of Diluted Earnings Per Share (Details)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]      
Weighted average basic common shares outstanding (in shares) 453,595 398,851 291,869
Effect of dilutive securities      
Restricted stock (in shares) 2,420 7,794 5,057
Convertible preferred stock (in shares) 0 0 18,423
Weighted average diluted common and potential common shares outstanding (in shares) 456,015 406,645 315,349