Annual report pursuant to Section 13 and 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 12 Months Ended
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 22, 2013
Class of Stock [Line Items]          
Common Stock, Shares, Issued   364,935,168 298,813,258   50,000,000
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 $ 763,557 $ 1,362,747 $ 1,006,847  
Proceeds from Issuance of Common Stock, Net   762,900      
Payments of Stock Issuance Costs $ 11,100