Purchased Receivables - Summary Of Components Of Net Purchased Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Purchased Receivables [Abstract]
Purchased receivables	$ 20,662	$ 13,507
Reserve for purchased receivable losses	(171)	(181)	$ (289)	$ (273)
Total	$ 20,491	$ 13,326