Annual report pursuant to Section 13 and 15(d)

SEGMENT REPORTING - Other Debt Segment Investments and Debt (Details)

v3.6.0.2
SEGMENT REPORTING - Other Debt Segment Investments and Debt (Details)
1 Months Ended 12 Months Ended
Aug. 31, 2016
security
Dec. 31, 2016
USD ($)
security
loan
Dec. 31, 2015
USD ($)
security
loan
Dec. 31, 2014
USD ($)
Oct. 31, 2015
USD ($)
Dec. 31, 2013
USD ($)
Segment Reporting Information [Line Items]            
Investments Carrying Value   $ 986,845,000 $ 1,017,975,000      
Face amount of debt   770,572,000 $ 971,270,000   $ 19,400,000  
Non-consolidated CDO Securities            
Segment Reporting Information [Line Items]            
Principal amount on investment   $ 0        
Number of securities sold | security 2          
Real Estate Related and other Loans            
Segment Reporting Information [Line Items]            
Loan Count | loan   6        
Carrying Value   $ 55,612,000        
Outstanding face amount   $ 138,148,000        
Real Estate Related and other Loans | Held-for-sale            
Segment Reporting Information [Line Items]            
Loan Count | loan   6 7      
Carrying Value   $ 55,612,000 $ 149,198,000 $ 230,200,000   $ 437,530,000
Outstanding face amount   $ 138,148,000        
Real Estate Related and other Loans | Mezzanine Loans            
Segment Reporting Information [Line Items]            
Loan Count | loan   2        
Carrying Value   $ 0        
Outstanding face amount   $ 17,800,000        
Real Estate Related and other Loans | Mezzanine Loans | Held-for-sale            
Segment Reporting Information [Line Items]            
Loan Count | loan   2 3      
Carrying Value   $ 0 $ 19,433,000      
Outstanding face amount   $ 17,767,000        
Real Estate Related and other Loans | Corporate Loans            
Segment Reporting Information [Line Items]            
Loan Count | loan   2        
Outstanding face amount   $ 45,700,000        
Real Estate Related and other Loans | Corporate Loans | Held-for-sale            
Segment Reporting Information [Line Items]            
Loan Count | loan   4 4      
Carrying Value   $ 55,612,000 $ 129,765,000      
Outstanding face amount   120,381,000        
Subprime | Subprime Mortgage Loans Subject to Call Option            
Segment Reporting Information [Line Items]            
Carrying Value   0 380,806,000      
Outstanding face amount   0        
Debt Investments            
Segment Reporting Information [Line Items]            
Principal amount on investment   698,503,000 765,703,000      
Investments Carrying Value   704,122,000 715,596,000      
Face amount of debt   600,964,000 839,008,000      
Debt Carrying Value   600,964,000 838,526,000      
Debt Investments | Unlevered real estate securities            
Segment Reporting Information [Line Items]            
Principal amount on investment   4,000,000 107,242,000      
Investments Carrying Value   1,950,000 59,034,000      
Face amount of debt   0 97,917,000      
Debt Carrying Value   $ 0 $ 97,605,000      
Number of securities sold | security   8        
Debt Investments | Unlevered real estate securities | Non-consolidated CDO Securities            
Segment Reporting Information [Line Items]            
Principal amount on investment   $ 0        
Number of securities | security     8      
Face amount of excluded real estate securities     $ 116,000,000      
Debt Investments | Levered real estate securities            
Segment Reporting Information [Line Items]            
Principal amount on investment   619,808,000 102,660,000      
Investments Carrying Value   627,304,000 105,963,000      
Face amount of debt   600,964,000 348,625,000      
Debt Carrying Value   600,964,000 348,625,000      
Debt Investments | Real estate related and other loans            
Segment Reporting Information [Line Items]            
Principal amount on investment   74,695,000 174,995,000      
Investments Carrying Value   55,612,000 149,198,000      
Face amount of debt   0 11,660,000      
Debt Carrying Value   0 11,490,000      
Debt Investments | Other investments            
Segment Reporting Information [Line Items]            
Investments Carrying Value   19,256,000 20,595,000      
Face amount of debt   0 0      
Debt Carrying Value   0 0      
Debt Investments | Subprime | Subprime Mortgage Loans Subject to Call Option            
Segment Reporting Information [Line Items]            
Principal amount on investment   0 380,806,000      
Investments Carrying Value   0 380,806,000      
Face amount of debt   0 380,806,000      
Debt Carrying Value   0 380,806,000      
Golf            
Segment Reporting Information [Line Items]            
Operating leases, rent expense   $ 3,800,000 $ 4,600,000 $ 5,000,000