Accrued Expenses and Other Current Liabilities (Schedule of Accrued Expenses and Other Current Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Accounts Payable and Accrued Liabilities, Current [Abstract]
Payroll and other related benefits	$ 34,480	$ 39,920
Bandwidth and co-location	27,299	29,291
Property, use and other taxes	22,394	9,923
Professional service fees	4,361	4,162
Other	2,542	2,075
Total	$ 91,076	$ 85,371