LOANS RECEIVABLE AND REVENUE - Delinquent Loans, Credit Services Organization - Aging Analysis (Details) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable guaranteed by the Company	$ 8,847	$ 13,017
Consumer Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable guaranteed by the Company	8,847	13,017
Consumer Portfolio Segment | 0-30 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable guaranteed by the Company	6,737	10,936
Consumer Portfolio Segment | 31-60 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable guaranteed by the Company	1,108	1,405
Consumer Portfolio Segment | 61-90 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable guaranteed by the Company	1,002	676
Consumer Portfolio Segment | Unsecured Installment
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable guaranteed by the Company	8,410	12,480
Consumer Portfolio Segment | Unsecured Installment | 0-30 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable guaranteed by the Company	6,358	10,477
Consumer Portfolio Segment | Unsecured Installment | 31-60 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable guaranteed by the Company	1,078	1,364
Consumer Portfolio Segment | Unsecured Installment | 61-90 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable guaranteed by the Company	974	639
Consumer Portfolio Segment | Secured Installment
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable guaranteed by the Company	437	537
Consumer Portfolio Segment | Secured Installment | 0-30 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable guaranteed by the Company	379	459
Consumer Portfolio Segment | Secured Installment | 31-60 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable guaranteed by the Company	30	41
Consumer Portfolio Segment | Secured Installment | 61-90 days past due
Loans and Leases Receivable Disclosure [Line Items]
Delinquent loans receivable guaranteed by the Company	$ 28	$ 37