Acquisition and Divestiture - Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Discontinued Operations and Disposal Groups [Abstract]
Service fee income	$ 18,229	$ 14,089	$ 47,061	$ 39,902
Income (loss) from continuing operations	335	3,083	(4,442)	1,848
Net income (loss)	$ 210	$ 2,883	$ (3,561)	$ 1,790
Basic and diluted earnings per share:
Continuing operations, basic and diluted (in dollars per share)	$ 0.00	$ 0.03	$ (0.05)	$ 0.02
Basic and diluted (in dollars per share)	$ 0.00	$ 0.03	$ (0.04)	$ 0.02