Purchased Receivables - Allowance on Net Purchase Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Purchased Receivable Allowance for Loan Loss Reserve [Roll Forward]
Balance, beginning of period			$ 190
Charge-offs	$ (68)	$ (100)	(177)	$ (1,204)
Balance, end of period	98		98
Purchased Receivable
Purchased Receivable Allowance for Loan Loss Reserve [Roll Forward]
Balance, beginning of period	141	209	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	(43)	(8)	(92)	1
Balance, end of period	$ 98	$ 201	$ 98	$ 201