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Repurchase Agreements Schedule of Repurchase Agreements by Maturity (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Repurchase Agreements [Line Items]    
Repurchase agreements $ 1,292,946 [1] $ 0
Debt, Weighted Average Interest Rate 0.38%  
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements 52 days  
Maturity up to 30 days [Member]
    
Repurchase Agreements [Line Items]    
Repurchase agreements 513,660  
Debt, Weighted Average Interest Rate 0.36%  
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements 11 days  
Maturity 31 to 60 days [Member]
    
Repurchase Agreements [Line Items]    
Repurchase agreements 412,485  
Debt, Weighted Average Interest Rate 0.38%  
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements 45 days  
Maturity 61 to 90 days [Member]
    
Repurchase Agreements [Line Items]    
Repurchase agreements 143,530  
Debt, Weighted Average Interest Rate 0.38%  
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements 74 days  
Maturity 91 to 120 days [Member]
    
Repurchase Agreements [Line Items]    
Repurchase agreements 28,897  
Debt, Weighted Average Interest Rate 0.39%  
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements 105 days  
Maturity 121 to 150 days [Member]
    
Repurchase Agreements [Line Items]    
Repurchase agreements 99,464  
Debt, Weighted Average Interest Rate 0.42%  
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements 136 days  
Maturity 151 to 180 days [Member]
    
Repurchase Agreements [Line Items]    
Repurchase agreements $ 94,910  
Debt, Weighted Average Interest Rate 0.41%  
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements 164 days  
[1] On the Company's Consolidated Balance Sheet, all balances associated with the repurchase agreements and financial derivatives are presented on a gross basis.