Purchased Receivables - Allowance on Net Purchase Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Purchased Receivable Allowance for Loan Loss Reserve [Roll Forward]
Balance, beginning of period			$ 190
Charge-offs	$ (29)	$ (9)	(206)	$ (1,213)
Balance, end of period	87		87
Purchased Receivable
Purchased Receivable Allowance for Loan Loss Reserve [Roll Forward]
Balance, beginning of period	98	201	190	200
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Charge-offs net of recoveries	0	0	0	0
(Benefit) reserve for purchased receivables	(11)	(5)	(103)	(4)
Balance, end of period	$ 87	$ 196	$ 87	$ 196