Description of Business and Summary of Significant Accounting Policies (Segment Reporting) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 ProductService_Groups	Jun. 30, 2013
Accounting Policies [Abstract]
Total revenue, international percentage			32.70%	31.50%
Number of product/service groups			4
Segment Reporting Information [Line Items]
Document Period End Date			Jun. 30, 2014
Operating revenue	$ 51,476	$ 51,004	$ 102,880	$ 103,570
Exchanges [Member]
Segment Reporting Information [Line Items]
Operating revenue	41,350	40,501	83,455	82,187
Broker Systems [Member]
Segment Reporting Information [Line Items]
Operating revenue	4,865	4,766	9,351	9,488
RCS [Member]
Segment Reporting Information [Line Items]
Operating revenue	3,652	4,013	7,077	8,177
Carrier Systems [Member]
Segment Reporting Information [Line Items]
Operating revenue	$ 1,609	$ 1,724	$ 2,997	$ 3,718