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INVESTMENTS IN CONSUMER LOANS - Carrying Value of Performing Consumer Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loans Receivable [Roll Forward]      
Proceeds from repayments $ (147,403) $ (94,807) $ (38,700)
Accretion of loan discount and premium amortization, net 701,967 1,031,384 747,932
Consumer Portfolio Segment | Performing Loans      
Loans Receivable [Roll Forward]      
Beginning balance 1,137,814 1,482,954  
Purchases 0  
Additional fundings 63,971 56,321  
Proceeds from repayments (257,182) (329,843)  
Accretion of loan discount and premium amortization, net 1,940 4,891  
Charge-offs (56,870) (73,842)  
Allowance for loan losses (388) (2,667)  
Ending balance $ 889,285 $ 1,137,814 $ 1,482,954