Accrued Expenses and Other Current Liabilities (Schedule of Accrued Expenses and Other Current Liabilities) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Accounts Payable and Accrued Liabilities, Current [Abstract]
Payroll and other related benefits	$ 28,097	$ 51,591
Bandwidth and co-location	21,189	21,787
Property, use and other taxes	29,806	15,849
Professional service fees	4,292	2,678
Contingent consideration	0	990
Other	1,881	1,766
Total	$ 85,265	$ 94,661