LOANS RECEIVABLE AND REVENUE - Loans Receivable by Product and Delinquency (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	$ 882,356	$ 553,722
Less: allowance for losses	(72,543)	(86,162)
Loans receivable, net	809,813	467,560
Current loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	799,224	483,478
Delinquent loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	83,132	70,244
Consumer Portfolio Segment | Delinquent loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	83,132	70,244
Consumer Portfolio Segment | Revolving LOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	720,054	358,884
Less: allowance for losses	(52,262)	(51,958)
Loans receivable, net	667,792	306,926
Consumer Portfolio Segment | Revolving LOC | Current loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	665,130	321,105
Consumer Portfolio Segment | Revolving LOC | Delinquent loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	54,924	37,779
Consumer Portfolio Segment | Total Installment - Company Owned
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	162,302	194,838
Less: allowance for losses	(20,281)	(34,204)
Loans receivable, net	142,021	160,634
Consumer Portfolio Segment | Total Installment - Company Owned | Current loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	134,094	162,373
Consumer Portfolio Segment | Total Installment - Company Owned | Delinquent loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	28,208	32,465
Consumer Portfolio Segment | Unsecured Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	82,805	102,425
Less: allowance for losses	(14,330)	(24,073)
Loans receivable, net	68,475	78,352
Consumer Portfolio Segment | Unsecured Installment | Current loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	61,852	78,235
Consumer Portfolio Segment | Unsecured Installment | Delinquent loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	20,953	24,190
Consumer Portfolio Segment | Secured Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	39,166	48,633
Less: allowance for losses	(3,482)	(7,047)
Loans receivable, net	35,684	41,586
Consumer Portfolio Segment | Secured Installment | Current loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	31,911	40,358
Consumer Portfolio Segment | Secured Installment | Delinquent loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	7,255	8,275
Consumer Portfolio Segment | Single-Pay
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	40,331	43,780
Less: allowance for losses	(2,469)	(3,084)
Loans receivable, net	37,862	40,696
Consumer Portfolio Segment | Single-Pay | Current loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	40,331	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	$ 11,100	$ 11,200