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Stock Based Compensation (Details) (USD $)	3 Months Ended		9 Months Ended
Stock Based Compensation (Details) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Stock-based compensation expense
Share-based compensation expense	$ 2,195,000	$ 3,049,000	$ 10,923,000	$ 6,261,000
Excluded and capitalized as part of internal-use software	21,000	44,000	66,000	197,000
Services cost of sales [Member]
Stock-based compensation expense
Share-based compensation expense	183,000	37,000	331,000	234,000
Engineering and technology [Member]
Stock-based compensation expense
Share-based compensation expense	332,000	251,000	894,000	684,000
Sales and marketing [Member]
Stock-based compensation expense
Share-based compensation expense	587,000	177,000	1,389,000	829,000
General and administrative [Member]
Stock-based compensation expense
Share-based compensation expense	1,093,000	2,584,000	8,309,000	4,673,000
Discontinued operations [Member]
Stock-based compensation expense
Share-based compensation expense	$ 0	$ 0	$ 0	$ 159,000

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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