Segment Reporting - Revenue by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues
Total Revenues	$ 120,610	$ 140,494	$ 245,278	$ 290,221
Corporate
Revenues
Total Revenues	2,763	229	3,110	462
Execution Services
Revenues
Total Revenues	83,408	105,427	173,201	218,394
Workflow Technology
Revenues
Total Revenues	23,094	23,550	46,687	48,623
Analytics
Revenues
Total Revenues	$ 11,345	$ 11,288	$ 22,280	$ 22,742