Stock Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Stock-based compensation expense
Share-based Compensation Expense	$ 2,020	$ 802	$ 8,728	$ 3,212
Excluded and capitalized as part of internal-use software	25	41	45	153
Services cost of sales [Member]
Stock-based compensation expense
Share-based Compensation Expense	68	53	148	197
Engineering and Technology [Member]
Stock-based compensation expense
Share-based Compensation Expense	306	178	562	433
Sales and marketing [Member]
Stock-based compensation expense
Share-based Compensation Expense	388	223	802	652
General and administrative [Member]
Stock-based compensation expense
Share-based Compensation Expense	1,258	884	7,216	2,089
Discontinued Operations [Member]
Stock-based compensation expense
Share-based Compensation Expense		$ 536		$ 159