Description of Business and Summary of Significant Accounting Policies (Segment Reporting) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 ProductService_Groups	Sep. 30, 2013
Accounting Policies [Abstract]
Total revenue, international percentage			32.80%	31.50%
Number of product/service groups			4
Segment Reporting Information [Line Items]
Document Period End Date			Sep. 30, 2014
Operating revenue	$ 50,808	$ 50,293	$ 153,688	$ 153,863
Exchanges [Member]
Segment Reporting Information [Line Items]
Operating revenue	41,757	40,554	125,212	122,741
Broker Systems [Member]
Segment Reporting Information [Line Items]
Operating revenue	4,511	4,390	13,862	13,878
RCS [Member]
Segment Reporting Information [Line Items]
Operating revenue	3,346	3,604	10,423	11,781
Carrier Systems [Member]
Segment Reporting Information [Line Items]
Operating revenue	$ 1,194	$ 1,745	$ 4,191	$ 5,463