Share-Based Compensation (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 4,152,000	$ 2,106,000	$ 8,716,000	$ 12,161,000
Date of Issuance [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting (percentage)			50.00%
Anniversary of initial vest date [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting (percentage)			50.00%
Cost of maintenance services [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	210,000	117,000	492,000	458,000
Cost of consulting services [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	538,000	407,000	1,213,000	1,590,000
Product development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	556,000	284,000	1,087,000	1,520,000
Sales and marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	906,000	223,000	2,004,000	3,083,000
General and administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	1,942,000	1,075,000	3,920,000	5,510,000
2012 Performance Program [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Number of shares authorized (in shares)	18,800,000		18,800,000
Stock-based compensation	$ 2,400,000