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Borrowings - Summary of Outstanding Balances, Maximum and Average Balances of Borrowings (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Balance $ 227,167 $ 225,158
Wells Facility borrowings [Member]
    
Debt Instrument [Line Items]    
Balance 156,969 [1] 225,155 [1]
Maximum Month-End Balance 225,156  
Average Month-End Balance 197,146  
UBS Facility borrowings [Member]
    
Debt Instrument [Line Items]    
Balance 70,195  
Maximum Month-End Balance 70,195  
Average Month-End Balance 7,020  
JPMorgan Facility borrowings [Member]
    
Debt Instrument [Line Items]    
Balance 3 3
Maximum Month-End Balance 3  
Average Month-End Balance $ 3  
[1] At December 31, 2012, borrowings outstanding under the Wells Facility bore interest at LIBOR plus 125 basis points, 150 basis points or 235 basis points depending on the collateral pledged. At September 30, 2013, borrowings outstanding under the Wells Facility bore interest at LIBOR plus 105 basis points or 175 basis points depending on the collateral pledged.