Accrued Expenses and Other Current Liabilities (Schedule of Accrued Expenses and Other Current Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Accounts Payable and Accrued Liabilities, Current [Abstract]
Payroll and other related benefits	$ 41,451	$ 39,920
Bandwidth and co-location	25,829	29,291
Property, use and other taxes	21,829	9,923
Professional service fees	3,750	4,162
Other	1,749	2,075
Total	$ 94,608	$ 85,371