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Borrowings - Weighted Average Maturities and Interest Rates of Borrowings (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]      
Debt Balance   $ 925,774 $ 622,194
London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Basis point   4.40%  
Line of Credit [Member]      
Debt Instrument [Line Items]      
Debt Balance   $ 925,774 $ 622,194
Weighted Average Remaining Maturity   2 years 8 months 12 days 3 years 2 months 12 days
Weighted Average Rate   2.90% 3.20%
Line of Credit [Member] | Wells Fargo [Member]      
Debt Instrument [Line Items]      
Debt Balance   $ 0 $ 20,166
Weighted Average Remaining Maturity     2 months 12 days
Weighted Average Rate   0.00% 1.00%
Basis point     0.80%
Line of Credit [Member] | UBS [Member]      
Debt Instrument [Line Items]      
Debt Balance   $ 133,899 $ 133,899
Weighted Average Remaining Maturity 4 years 2 years 8 months 12 days 3 years 8 months 12 days
Weighted Average Rate   2.80% 2.80%
Line of Credit [Member] | DB Facility [Member]      
Debt Instrument [Line Items]      
Debt Balance   $ 300,005 $ 300,005
Weighted Average Remaining Maturity   2 years 3 months 18 days 3 years 3 months 18 days
Weighted Average Rate   3.70% 3.70%
Line of Credit [Member] | JP Morgan Chase [Member]      
Debt Instrument [Line Items]      
Debt Balance   $ 445,942 $ 168,124
Weighted Average Remaining Maturity   3 years 1 month 6 days 1 month 6 days
Weighted Average Rate   2.60% 2.70%
Line of Credit [Member] | Goldman Sachs [Member]      
Debt Instrument [Line Items]      
Debt Balance   $ 45,928 $ 0
Weighted Average Remaining Maturity   3 years 3 months 18 days  
Weighted Average Rate   3.80% 0.00%
Line of Credit [Member] | Goldman Sachs [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Basis point   3.50% 3.50%
Minimum [Member] | Line of Credit [Member] | DB Facility [Member] | Three Month LIBOR [Member]      
Debt Instrument [Line Items]      
Basis point     1.80%
Minimum [Member] | Line of Credit [Member] | JP Morgan Chase [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Basis point   2.25% 2.25%
Maximum [Member] | Line of Credit [Member] | DB Facility [Member] | Three Month LIBOR [Member]      
Debt Instrument [Line Items]      
Basis point     2.32%
Maximum [Member] | Line of Credit [Member] | JP Morgan Chase [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Basis point   4.75% 4.75%