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LOANS RECEIVABLE AND INVESTMENTS (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loans, unsecured loans, and other available-for-sale securities, carrying amount $ 1,407,389 $ 754,565
Secured loans, unsecured loans, and other available-for-sale securities, amortized cost 1,406,383 753,326
Secured loans, unsecured loans, and other available-for-sale securities, fair value 1,426,240 764,656
Non-mortgage loans receivable, net, carrying amount 54,955 52,544
Government-sponsored pooled loan investments, unrealized gain (loss) 1,006 1,239
Total investments reported as Secured loans receivable and investments, net    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loans, unsecured loans, and other available-for-sale securities, carrying amount 1,352,434 702,021
Secured loans, unsecured loans, and other available-for-sale securities, amortized cost 1,351,428 700,782
Secured loans, unsecured loans, and other available-for-sale securities, fair value 1,371,142 711,030
Government-sponsored pooled loan investments, unrealized gain (loss) 1,006 1,239
Total investments reported as Other assets    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loans, unsecured loans, and other available-for-sale securities, carrying amount 54,955 52,544
Secured loans, unsecured loans, and other available-for-sale securities, amortized cost 54,955 52,544
Secured loans, unsecured loans, and other available-for-sale securities, fair value 55,098 53,626
Government-sponsored pooled loan investments, unrealized gain (loss) 0 0
Government-sponsored pooled loan investments    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Government-sponsored pooled loan investments (1) 54,478 55,049
Government-sponsored pooled loan investments, amortized cost 53,472 53,810
Government-sponsored pooled loan investments, unrealized gain (loss) 1,006 1,239
Secured/mortgage loans and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loan receivable, carrying amount and amortized cost 1,297,956 646,972
Mortgage loans and other, fair value 1,316,664 655,981
Government-sponsored pooled loan investments, unrealized gain (loss) 0 0
Non-mortgage loans receivable, net    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-mortgage loans receivable, net, carrying amount 54,955 52,544
Non-mortgage loans receivable, net, fair value 55,098 53,626
Government-sponsored pooled loan investments, unrealized gain (loss) $ 0 $ 0