LOANS RECEIVABLE AND REVENUE - Delinquent Loans - Aging Analysis (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	$ 55,089	$ 60,980
Consumer Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	55,089	60,980
Consumer Portfolio Segment | 0-30 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	24,603	26,474
Consumer Portfolio Segment | 31-60 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	15,778	16,464
Consumer Portfolio Segment | 61-90 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	14,708	18,042
Consumer Portfolio Segment | Unsecured Installment
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	40,272	44,963
Consumer Portfolio Segment | Unsecured Installment | 0-30 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	17,052	18,358
Consumer Portfolio Segment | Unsecured Installment | 31-60 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	11,886	12,836
Consumer Portfolio Segment | Unsecured Installment | 61-90 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	11,334	13,769
Consumer Portfolio Segment | Secured Installment
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	14,817	16,017
Consumer Portfolio Segment | Secured Installment | 0-30 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	7,551	8,116
Consumer Portfolio Segment | Secured Installment | 31-60 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	3,892	3,628
Consumer Portfolio Segment | Secured Installment | 61-90 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable	$ 3,374	$ 4,273