Segment Reporting - Revenue by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues
Total Revenues	$ 119,589	$ 104,185	$ 120,610	$ 124,668	$ 224,173	$ 120,409	$ 140,494	$ 149,727	$ 469,052	$ 634,803	$ 559,814
Execution Services
Revenues
Total Revenues									328,252	386,158	416,571
Workflow Technology
Revenues
Total Revenues									92,891	94,117	95,926
Analytics
Revenues
Total Revenues									44,198	45,891	46,012
Corporate
Revenues
Total Revenues									$ 3,711	$ 108,637	$ 1,305