Description of Business and Summary of Significant Accounting Policies (Segment Reporting) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013 ProductService_Groups	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Total revenue, international percentage													31.80%	29.30%	28.50%
Number of product/service groups													4
Operating revenue	$ 50,847	$ 50,293	$ 51,004	$ 52,566	$ 54,023	$ 53,804	$ 47,716	$ 43,827	$ 44,050	$ 42,602	$ 42,267	$ 40,050	$ 204,710	$ 199,370	$ 168,969
Exchanges [Member]
Segment Reporting Information [Line Items]
Operating revenue													163,925	159,678	130,638
Broker Systems [Member]
Segment Reporting Information [Line Items]
Operating revenue													18,378	18,612	18,006
BPO [Member]
Segment Reporting Information [Line Items]
Operating revenue													15,678	16,140	14,944
Carrier Systems [Member]
Segment Reporting Information [Line Items]
Operating revenue													$ 6,729	$ 4,940	$ 5,381