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Borrowings - Summary of Outstanding Balances, Maximum and Average Balances of Borrowings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Line of Credit Facility [Line Items]    
Line of credit, Balance $ 925,774 $ 622,194
Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of credit, Balance 925,774 622,194
Wells Fargo [Member] | Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of credit, Balance 0 20,166
Maximum Month-End Balance 22,254 47,751
Average Month-End Balance 3,263 28,921
UBS [Member] | Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of credit, Balance 133,899 133,899
Maximum Month-End Balance 133,899 133,899
Average Month-End Balance 133,899 133,899
DB Facility [Member] | Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of credit, Balance 300,005 300,005
Maximum Month-End Balance 300,005 300,005
Average Month-End Balance 300,005 145,856
JP Morgan Chase [Member] | Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of credit, Balance 445,942 168,124
Maximum Month-End Balance 445,942 169,066
Average Month-End Balance 261,261 105,366
Goldman Sachs [Member] | Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of credit, Balance 45,928 $ 0
Maximum Month-End Balance 52,524  
Average Month-End Balance $ 45,665