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Summary of Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock-based compensation expense
Total Share-based compensation expense	$ 5,397	$ 3,642	$ 4,874
Cost of services and fulfillment [Member]
Stock-based compensation expense
Total Share-based compensation expense	3,085	1,644	2,094
Selling and marketing [Member]
Stock-based compensation expense
Total Share-based compensation expense	894	751	943
General and administrative [Member]
Stock-based compensation expense
Total Share-based compensation expense	$ 1,418	$ 1,247	$ 1,837

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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