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MORTGAGE LOAN RECEIVABLES - Mortgage Loan Receivables by Loan Type (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Realized gain on sale of mortgage loan receivables   $ 0 $ 0 $ 0  
Mortgage loans held by consolidated subsidiaries, beginning balance $ 3,508,642 3,508,642 2,353,977 2,310,409  
Origination of mortgage loan receivables   2,775,992 2,873,304 2,098,052  
Purchases of mortgage loan receivables   0 94,079 73,421  
Proceeds from sales of mortgage loan receivables(3)   (1,532,308) (386,852) (722,360)  
Sale of loans, net   (16,511) (54,046) (26,009)  
Transfer between held for investment and held for sale   0 0 0  
Accretion/amortization of discount, premium and other fees   (19,820) (11,180) (8,941)  
Provision for loan and lease losses   13,900 0 300  
Mortgage loans held by consolidated subsidiaries, ending balance   3,482,929 3,508,642 2,353,977  
Outstanding Face Amount   3,522,286 3,533,236    
Provision for loan losses [1]   (17,900) (4,000)    
Provision for loan losses   (17,900) (4,000) (4,000) $ (3,700)
Carrying Value   3,482,929 3,508,642    
Loans held for sale transferred to loans held for investments, fair value   $ 55,400 $ 119,900    
Loans from held for sale transferred to portfolio loans, remaining maturity 3 years 2 years 6 months 7 days 3 years 6 months 7 days    
Mortgage loans held by consolidated subsidiaries          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Realized gain on sale of mortgage loan receivables   $ 0   0  
Mortgage loans held by consolidated subsidiaries, beginning balance $ 3,282,462 3,282,462 $ 2,000,095 1,742,345  
Origination of mortgage loan receivables   1,478,771 1,407,669 969,401  
Purchases of mortgage loan receivables   0 94,079 0  
Proceeds from sales of mortgage loan receivables(3)   (1,518,066) (384,283) (720,592)  
Sale of loans, net   0 0 0  
Transfer between held for investment and held for sale   55,403 153,722 0  
Accretion/amortization of discount, premium and other fees   (19,820) (11,180) 8,941  
Provision for loan and lease losses   0      
Mortgage loans held by consolidated subsidiaries, ending balance   3,318,390 3,282,462 2,000,095  
First mortgage loans          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Outstanding Face Amount   3,192,160 3,140,788    
Carrying value   3,170,788 3,123,268    
Mezzanine loans          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Outstanding Face Amount   148,221 159,921    
Carrying value   147,602 159,194    
Mortgage loan receivables held for investment, net, at amortized cost          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Provision for loan and lease losses   13,900   300  
Outstanding Face Amount   3,340,381 3,300,709    
Provision for loan losses   (17,900) (4,000) (4,000) $ (3,700)
Carrying value   3,318,390 3,282,462    
Carrying Value   3,300,490 3,278,462    
First mortgage loans          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Outstanding Face Amount   181,905 232,527    
Carrying Value   182,439 230,180    
Mortgage loan receivables held for sale          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Realized gain on sale of mortgage loan receivables   0 0 0  
Mortgage loans held by consolidated subsidiaries, beginning balance $ 230,180 230,180 357,882 571,764  
Origination of mortgage loan receivables   1,297,221 1,465,635 1,128,651  
Purchases of mortgage loan receivables   0 0 73,421  
Proceeds from sales of mortgage loan receivables(3)   (14,242) (2,569) (1,768)  
Sale of loans, net   (16,511) (54,046) 26,009  
Transfer between held for investment and held for sale   (55,403) (153,722) 0  
Accretion/amortization of discount, premium and other fees   0 0 0  
Provision for loan and lease losses   0   0  
Mortgage loans held by consolidated subsidiaries, ending balance   182,439 230,180 $ 357,882  
Outstanding Face Amount   181,905 232,527    
Carrying Value   $ 182,439 $ 230,180    
[1] Includes amounts relating to consolidated variable interest entities. See Note 3.