LOANS RECEIVABLE AND REVENUE - Loans Receivable by Product and Delinquency (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	$ 769,228	$ 553,722
Less: allowance for losses	(67,861)	(86,162)
Loans receivable, net	701,367	467,560
Current loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	698,684	483,478
Delinquent loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	70,544	70,244
Consumer Portfolio Segment | Delinquent loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	70,544	70,244
Consumer Portfolio Segment | Revolving LOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	606,430	358,884
Less: allowance for losses	(44,848)	(51,958)
Loans receivable, net	561,582	306,926
Consumer Portfolio Segment | Revolving LOC | Current loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	562,497	321,105
Consumer Portfolio Segment | Revolving LOC | Delinquent loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	43,933	37,779
Consumer Portfolio Segment | Total Installment - Company Owned
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	162,798	194,838
Less: allowance for losses	(23,013)	(34,204)
Loans receivable, net	139,785	160,634
Consumer Portfolio Segment | Total Installment - Company Owned | Current loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	136,187	162,373
Consumer Portfolio Segment | Total Installment - Company Owned | Delinquent loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	26,611	32,465
Consumer Portfolio Segment | Unsecured Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	86,638	102,425
Less: allowance for losses	(16,701)	(24,073)
Loans receivable, net	69,937	78,352
Consumer Portfolio Segment | Unsecured Installment | Current loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	65,603	78,235
Consumer Portfolio Segment | Unsecured Installment | Delinquent loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	21,035	24,190
Consumer Portfolio Segment | Secured Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	37,400	48,633
Less: allowance for losses	(3,880)	(7,047)
Loans receivable, net	33,520	41,586
Consumer Portfolio Segment | Secured Installment | Current loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	31,824	40,358
Consumer Portfolio Segment | Secured Installment | Delinquent loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	5,576	8,275
Consumer Portfolio Segment | Single-Pay
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	38,760	43,780
Less: allowance for losses	(2,432)	(3,084)
Loans receivable, net	36,328	40,696
Consumer Portfolio Segment | Single-Pay | Current loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	38,760	43,780
Consumer Portfolio Segment | Single-Pay | Delinquent loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	0	0
Consumer Portfolio Segment | Single-Pay | Canada
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	$ 10,000	$ 11,200