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INVESTMENTS IN CONSUMER LOANS - Changes in Consumer Loan Equity Method Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Aug. 31, 2017
Sep. 30, 2016
Sep. 30, 2017
Aug. 31, 2017
Sep. 30, 2016
Increase (Decrease) in Equity Method Investments [Roll Forward]            
Earnings from investments in consumer loans, equity method investees $ 6,769   $ 0 $ 12,649   $ 0
Consumer Portfolio Segment | LoanCo and WarrantCo            
Increase (Decrease) in Equity Method Investments [Roll Forward]            
Beginning balance       0    
Contributions to equity method investees       344,902    
Distributions of earnings from equity method investees       (4,291)    
Distributions of capital from equity method investees       (306,938)    
Earnings from investments in consumer loans, equity method investees   $ 6,769   12,649 $ 12,649  
Ending balance $ 46,322 $ 42,044   $ 46,322 $ 42,044