Accrued Expenses and Other Current Liabilities (Schedule of Accrued Expenses and Other Current Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accounts Payable and Accrued Liabilities, Current [Abstract]
Payroll and other related benefits	$ 75,039	$ 39,920
Bandwidth and co-location	27,260	29,291
Property, use and other taxes	22,093	9,923
Professional service fees	3,643	4,162
Other	5,052	2,075
Total	$ 133,087	$ 85,371