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 6 Months Ended
Mar. 31, 2013
Jun. 30, 2013
Jun. 30, 2012
Mar. 22, 2013
Dec. 31, 2012
Class of Stock [Line Items]          
Common Stock, Shares, Issued   365,733,931   50,000,000 298,813,258
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 $ 763,226 $ 769,812    
Proceeds from Issuance of Common Stock, Net   762,900      
Payments of Stock Issuance Costs $ 11,100