Purchased Receivables - Summary of Components of Net Purchased Receivables (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Purchased Receivables [Abstract]
Purchased receivables	$ 13,759		$ 13,507
Reserve for purchased receivable losses	(163)	$ (169)	(181)	$ (247)	$ (265)	$ (289)
Total	$ 13,596		$ 13,326