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Stock-Based Compensation Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Stock based compensation expense included in operating expense
Total stock-based compensation	$ 3,715	$ 3,952	$ 12,439	$ 11,409
Income tax benefit related to stock-based compensation included in net income (loss)	1,088	1,800	3,750	3,989
Service costs [Member]
Stock based compensation expense included in operating expense
Total stock-based compensation	419	325	1,178	924
Sales and marketing [Member]
Stock based compensation expense included in operating expense
Total stock-based compensation	278	461	2,353	1,101
Product development [Member]
Stock based compensation expense included in operating expense
Total stock-based compensation	176	470	779	1,174
General and administrative [Member]
Stock based compensation expense included in operating expense
Total stock-based compensation	$ 2,842	$ 2,696	$ 8,129	$ 8,210

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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