Purchased Receivables - Allowance on Net Purchase Receivables (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Purchased Receivable Allowance for Loan Loss Reserve [Roll Forward]
Balance, beginning of period	$ 94
Charge-offs	(165)	$ (109)
Balance, end of period	99
Purchased Receivable
Purchased Receivable Allowance for Loan Loss Reserve [Roll Forward]
Balance, beginning of period	94	190
Charge-offs	0	0
Recoveries	0	0
Charge-offs net of recoveries	0	0
Reserve (benefit) for purchased receivables	5	(49)
Balance, end of period	$ 99	$ 141