Stock-Based Compensation (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Stock-Based Compensation Expense
Stock-based employee compensation expense	$ 6,605,000	$ 7,628,000
Tax effect on stock-based compensation expense	(2,694,000)	(2,927,000)
Total unrecognized compensation cost	38,200,000
Weighted average period for recognition of compensation cost	2 years 1 month 6 days
Continuing operations
Stock-Based Compensation Expense
Effect on net income, net of tax	3,911,000	4,701,000
Total cost of revenues
Stock-Based Compensation Expense
Stock-based employee compensation expense	1,064,000	1,217,000
Cost of recurring revenues
Stock-Based Compensation Expense
Stock-based employee compensation expense	753,000	842,000
Cost of non-recurring revenues
Stock-Based Compensation Expense
Stock-based employee compensation expense	311,000	375,000
Total operating expenses
Stock-Based Compensation Expense
Stock-based employee compensation expense	5,541,000	6,411,000
Sales and marketing
Stock-Based Compensation Expense
Stock-based employee compensation expense	2,380,000	2,635,000
Product development
Stock-Based Compensation Expense
Stock-based employee compensation expense	1,502,000	1,925,000
General and administrative
Stock-Based Compensation Expense
Stock-based employee compensation expense	$ 1,659,000	$ 1,851,000