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INVESTMENTS IN CONSUMER LOANS - Unpaid Principal Balance of Purchased Credit Deteriorated Loans (Details) - Receivables Acquired with Deteriorated Credit Quality - Consumer Portfolio Segment - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 182,171 $ 221,910
Carrying Value $ 147,059 $ 182,917