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Equity and Debt Investments - Debt Securities (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
security
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
security
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
security
Debt Securities, Available-for-sale [Line Items]          
Allowance for credit loss recorded $ 1,700,000   $ 24,000,000.0    
Number of AFS debt securities with unrealized loss without allowance for credit loss | security 0   0    
OTTI loss   $ 6,400,000   $ 7,100,000  
Number of AFS debt securities with unrealized loss in AOCI | security         0
N-Star CDO bonds, available for sale          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost Without Allowance for Credit Loss $ 46,739,000   $ 46,739,000   $ 46,002,000
Allowance for Credit Loss (23,973,000)   (23,973,000)    
Gross cumulative unrealized gains 5,132,000   5,132,000   8,857,000
Gross cumulative unrealized loss 0   0   0
Fair Value $ 27,898,000   27,898,000   $ 54,859,000
Colony | CMBS of consolidated fund, at fair value          
Debt Securities, Available-for-sale [Line Items]          
Proceeds from sale     $ 0 $ 0  
Maximum          
Debt Securities, Available-for-sale [Line Items]          
Expected maturity period     3 years 3 months 18 days