Purchased Receivables - Summary of Components of Net Purchased Receivables (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Purchased Receivables [Abstract]
Purchased receivables	$ 13,956		$ 15,543
Reserve for purchased receivable losses	(224)	$ (247)	(289)	$ (483)	$ (242)	$ (273)
Total	$ 13,732		$ 15,254