Purchased Receivables - Summary of Components of Net Purchased Receivables (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Purchased Receivables [Abstract]
Purchased receivables	$ 15,663		$ 13,507
Reserve for purchased receivable losses	(163)	$ (163)	(181)	$ (224)	$ (247)	$ (289)
Total	$ 15,500		$ 13,326