Purchased Receivables - Allowance on Net Purchase Receivables (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Purchased Receivable Allowance for Loan Loss Reserve [Roll Forward]
Balance at beginning of period	$ 194,000	$ 163,000	$ 171,000	$ 181,000
Charge-offs	(1,203,000)	(22,000)	(1,689,000)	(891,000)
Balance at end of period	200,000	163,000	200,000	163,000
Purchased Receivable
Purchased Receivable Allowance for Loan Loss Reserve [Roll Forward]
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Charge-offs net of recoveries	0	0	0	0
Reserve for (recovery from) purchased receivables	$ 6,000	$ 0	$ 29,000	$ (18,000)