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Offsetting of Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Offsetting Assets and Liabilities [Line Items]    
Financial derivatives-assets at fair value $ 23,181 [1] $ 0
Derivative, Fair Value, Net 16,114  
Financial derivatives-liabilities at fair value (7,067) [1] 0
Repurchase agreements (1,292,946) [1] 0
Repurchase agreements, net (1,292,946) [1]  
Repurchase Agreements, collateral amount 1,296,756 [2],[3]  
Cash Collateral Received Pledged for Repurchase Agreements (3,810) [2]  
Repurchse agreements and related collateral, net 0  
Derivative Financial Instruments, Liabilities [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Derivative, Fair Value, Net 0 [1]  
Securities collateral on derivatives 0 [2],[3]  
Cash collateral received or pledged for derivatives 0 [2]  
Derivatives and related collateral, net 0  
Derivative Financial Instruments, Assets [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Derivative, Fair Value, Net 16,114 [1]  
Securities collateral on derivatives 0 [2],[3]  
Cash collateral received or pledged for derivatives (3,311) [2]  
Derivatives and related collateral, net $ 12,803  
[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] As collateral is called or posted per counterparty it is generally called or posted across all positions with each respective counterparty.
[3] Amounts disclosed in the Financial Instruments column of the table represent collateral that is available to be offset against balances associated with repurchase agreements.