Purchased Receivables - Summary of Components of Net Purchased Receivables (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Purchased Receivables [Abstract]
Purchased receivables	$ 14,295		$ 15,543
Reserve for purchased receivable losses	(247)	$ (265)	(289)	$ (243)	$ (236)	$ (273)
Total	$ 14,048		$ 15,254