Segment Reporting - Revenue by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues
Total Revenues	$ 104,185	$ 120,409	$ 349,463	$ 410,630
Corporate
Revenues
Total Revenues	296	221	3,406	683
Execution Services
Revenues
Total Revenues	70,240	85,734	243,441	304,128
Workflow Technology
Revenues
Total Revenues	22,723	22,837	69,410	71,460
Analytics
Revenues
Total Revenues	$ 10,926	$ 11,617	$ 33,206	$ 34,359