Accrued Expenses and Other Current Liabilities (Schedule of Accrued Expenses and Other Current Liabilities) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Accounts Payable and Accrued Liabilities, Current [Abstract]
Payroll and other related benefits	$ 23,083	$ 51,591
Bandwidth and co-location	20,299	21,787
Property, use and other taxes	36,748	15,849
Professional service fees	5,505	2,678
Contingent consideration	0	990
Other	1,274	1,766
Total	$ 86,909	$ 94,661