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Borrowings - Remaining Maturities of Borrowings (Details) - Line of Credit [Member]
$ in Thousands
Dec. 31, 2015
USD ($)
Line of Credit Facility [Line Items]  
Less than 1 year $ 145,557
1 to 3 years 487,310
3 to 5 years 292,907
More than 5 years 0
Total 925,774
UBS [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 5,004
1 to 3 years 128,895
3 to 5 years 0
More than 5 years 0
Total 133,899
DB Facility [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 74,251
1 to 3 years 225,754
3 to 5 years 0
More than 5 years 0
Total 300,005
JP Morgan Chase [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 62,454
1 to 3 years 122,081
3 to 5 years 261,407
More than 5 years 0
Total 445,942
Goldman Sachs [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 3,848
1 to 3 years 10,580
3 to 5 years 31,500
More than 5 years 0
Total $ 45,928