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Derivative Instruments Schedule of TBA Securities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Derivative [Line Items]    
Financial derivatives-assets at fair value $ 23,181 [1] $ 0
Financial derivatives-liabilities at fair value (7,067) [1] 0
Derivative, Fair Value, Net 16,114  
TBA securities [Member]
    
Derivative [Line Items]    
Derivative notional, net (435,229) [2]  
Derivative cost basis (445,891) [3]  
Market Value, Underyling (451,359) [4]  
Derivative, Fair Value, Net (5,468) [5]  
Derivative Financial Instruments, Assets [Member]
    
Derivative [Line Items]    
Derivative, Fair Value, Net 16,114 [1]  
Derivative Financial Instruments, Assets [Member] | TBA securities- purchase contracts [Member]
    
Derivative [Line Items]    
Derivative notional 3,350 [2]  
Derivative cost basis 3,169 [3]  
Market Value, Underyling 3,273 [4]  
Financial derivatives-assets at fair value 104 [5]  
Derivative Financial Instruments, Liabilities [Member]
    
Derivative [Line Items]    
Derivative, Fair Value, Net 0 [1]  
Derivative Financial Instruments, Liabilities [Member] | TBA securities- sale contracts [Member]
    
Derivative [Line Items]    
Derivative notional (438,579) [2]  
Derivative cost basis (449,060) [3]  
Market Value, Underyling (454,632) [4]  
Financial derivatives-liabilities at fair value $ (5,572) [5]  
[1] On the Company's Consolidated Balance Sheet, all balances associated with the repurchase agreements and financial derivatives are presented on a gross basis.
[2] Notional amount represents the principal balance of the underlying Agency RMBS.
[3] Cost basis represents the forward price to be paid for the underlying Agency RMBS.
[4] Market value represents the current market value of the underlying Agency RMBS (on a forward delivery basis) as of September 30, 2013.
[5] Net carrying value represents the difference between the market value of the TBA contract as of September 30, 2013 and the cost basis and is reported in Financial derivatives-assets at fair value and Financial derivatives-liabilities at fair value on the Consolidated Balance Sheet.