Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity Public Offerings (Details)

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Stockholders' Equity Public Offerings (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 22, 2013
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Class of Stock [Line Items]        
Common Stock, Shares, Issued 50,000,000 362,142,394   298,813,258
Common Stock, Shares, Issued Pursuant to the Underwriters' Over-allotments 7,500,000      
Sale of Stock, Price Per Share $ 13.46      
Proceeds from Issuance of Common Stock $ 774,000 $ 763,042 $ 692,000  
Proceeds from Issuance of Common Stock, Net   762,900    
Payments of Stock Issuance Costs   $ 11,100