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, 2012	Jun. 30, 2011	Jun. 30, 2012 ProductService_Groups	Jun. 30, 2011
Segment Reporting Information [Line Items]
Total revenue, international percentage			29.30%	28.50%
Number of product/service groups			4
Operating revenue	$ 47,716	$ 42,267	$ 91,543	$ 82,317
Carrier Systems [Member]
Segment Reporting Information [Line Items]
Operating revenue	1,222	1,468	2,078	2,992
Exchanges [Member]
Segment Reporting Information [Line Items]
Operating revenue	38,182	32,222	72,828	63,287
BPO [Member]
Segment Reporting Information [Line Items]
Operating revenue	3,890	3,753	7,461	7,372
Broker Systems [Member]
Segment Reporting Information [Line Items]
Operating revenue	$ 4,422	$ 4,824	$ 9,176	$ 8,666