Description of Business and Summary of Significant Accounting Policies (Segment Reporting) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 ProductService_Groups	Mar. 31, 2012
Accounting Policies [Abstract]
Total revenue, international percentage	31.10%	30.40%
Number of product/service groups	4
Segment Reporting Information [Line Items]
Operating revenue	$ 52,566	$ 43,827
Exchanges [Member]
Segment Reporting Information [Line Items]
Operating revenue	41,686	34,646
Broker Systems [Member]
Segment Reporting Information [Line Items]
Operating revenue	4,722	4,754
Business Process Outsourcing (“BPO”) [Member]
Segment Reporting Information [Line Items]
Operating revenue	4,164	3,571
Carrier Systems [Member]
Segment Reporting Information [Line Items]
Operating revenue	$ 1,994	$ 856