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Borrowings - Weighted Average Maturities and Interest Rates of Borrowings (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Sep. 29, 2016
Debt Instrument [Line Items]      
Borrowings under repurchase agreements (net of deferred financing costs of $6,763 and $7,353 in 2016 and 2015, respectively) $ 1,139,803,000 $ 918,421,000  
Deferred financing costs (6,763,000) (7,353,000)  
Line of Credit [Member]      
Debt Instrument [Line Items]      
Borrowings under repurchase agreements (net of deferred financing costs of $6,763 and $7,353 in 2016 and 2015, respectively) $ 1,139,803,000 $ 918,421,000  
Weighted average rate 3.18% 2.92%  
Deferred financing costs $ (6,763,000) $ (7,353,000)  
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Basis point 0.77% 0.43%  
Line of Credit [Member] | JP Morgan Chase [Member]      
Debt Instrument [Line Items]      
Maximum borrowing under facility $ 943,000,000 $ 600,000,000  
Borrowings under repurchase agreements (net of deferred financing costs of $6,763 and $7,353 in 2016 and 2015, respectively) 657,452,000 $ 445,942,000  
Line of Credit [Member] | JP Morgan Chase [Member] | General Facility [Member]      
Debt Instrument [Line Items]      
Line of credit, amount outstanding 800,000,000    
Line of Credit [Member] | JP Morgan Chase [Member] | Asset Specific Financing [Member]      
Debt Instrument [Line Items]      
Maximum borrowing under facility 143,000    
Line of credit, amount outstanding $ 143,000,000    
Line of Credit [Member] | JP Morgan Chase [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Basis point 2.25% 2.25%  
Line of Credit [Member] | Deutsche Bank Repurchase Facility [Member]      
Debt Instrument [Line Items]      
Maximum borrowing under facility $ 300,000,000   $ 300,000,000
Borrowings under repurchase agreements (net of deferred financing costs of $6,763 and $7,353 in 2016 and 2015, respectively) $ 137,355,000    
Line of Credit [Member] | Deutsche Bank Repurchase Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Basis point 2.66%    
Line of Credit [Member] | Goldman Sachs [Member]      
Debt Instrument [Line Items]      
Borrowings under repurchase agreements (net of deferred financing costs of $6,763 and $7,353 in 2016 and 2015, respectively) $ 40,657,000 $ 45,928,000  
Line of Credit [Member] | Goldman Sachs [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Basis point 3.50% 3.50%  
Line of Credit [Member] | JP Morgan Chase, DB Repurchase Facility, and Goldman Sachs [Member]      
Debt Instrument [Line Items]      
Borrowings under repurchase agreements (net of deferred financing costs of $6,763 and $7,353 in 2016 and 2015, respectively) $ 835,464,000 $ 491,870,000  
Line of Credit [Member] | JP Morgan Chase, DB Repurchase Facility, and Goldman Sachs [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Basis point 2.38% 2.37%  
Line of Credit [Member] | UBS [Member]      
Debt Instrument [Line Items]      
Borrowings under repurchase agreements (net of deferred financing costs of $6,763 and $7,353 in 2016 and 2015, respectively) $ 133,899,000 $ 133,899,000  
Weighted average rate 2.79% 2.79%  
Line of Credit [Member] | Deutsche Bank [Member]      
Debt Instrument [Line Items]      
Borrowings under repurchase agreements (net of deferred financing costs of $6,763 and $7,353 in 2016 and 2015, respectively) $ 177,203,000 $ 300,005,000  
Weighted average rate 3.63% 3.69%  
Line of Credit [Member] | UBS and Deutsche Bank [Member]      
Debt Instrument [Line Items]      
Borrowings under repurchase agreements (net of deferred financing costs of $6,763 and $7,353 in 2016 and 2015, respectively) $ 311,102,000 $ 433,904,000  
Weighted average rate 3.27% 3.39%  
Line of Credit [Member] | DB Facility [Member] | Three Month LIBOR [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Basis point   1.80%  
Line of Credit [Member] | DB Facility [Member] | Three Month LIBOR [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Basis point   2.32%