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Debt Securities - Available for Sale Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost   $ 307,981
Gains   16,510
Losses   (1,248)
Fair Value   323,243
Debt securities, at fair value $ 96,833 348,342
N-Star CDO bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 67,513 88,374
Gains 1,565 2,778
Losses (4,951) (219)
Fair Value 64,127 90,933
CMBS and other securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost   13,829
Gains   3,739
Losses   (186)
Fair Value   17,382
CMBS    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost   144,476
Gains   3,999
Losses   (530)
Fair Value   147,945
Debt securities, at fair value $ 32,706 25,099
Other securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost   61,302
Gains   5,994
Losses   (313)
Fair Value   66,983
Bonds | Variable Interest Entity, Primary Beneficiary    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost   $ 215,500