LOANS RECEIVABLE AND REVENUE - Delinquent Loans - Aging Analysis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	$ 53,592	$ 60,980
Consumer Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	53,592	60,980
Consumer Portfolio Segment | 0-30 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	19,407	26,474
Consumer Portfolio Segment | 31-60 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	16,866	16,464
Consumer Portfolio Segment | 61-90 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	17,319	18,042
Consumer Portfolio Segment | Unsecured Installment
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	39,273	44,963
Consumer Portfolio Segment | Unsecured Installment | 0-30 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	13,133	18,358
Consumer Portfolio Segment | Unsecured Installment | 31-60 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	12,500	12,836
Consumer Portfolio Segment | Unsecured Installment | 61-90 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	13,640	13,769
Consumer Portfolio Segment | Secured Installment
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	14,319	16,017
Consumer Portfolio Segment | Secured Installment | 0-30 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	6,274	8,116
Consumer Portfolio Segment | Secured Installment | 31-60 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	4,366	3,628
Consumer Portfolio Segment | Secured Installment | 61-90 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	$ 3,679	$ 4,273