Accrued Expenses - Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts Payable and Accrued Liabilities, Current [Abstract]
Payroll and other related benefits	$ 218,588	$ 190,721
Bandwidth and co-location	67,170	65,213
Income tax payable	50,812	40,337
Property, use and other taxes	35,390	30,904
Professional service fees	2,245	1,775
Other accrued expenses	6,263	5,911
Total	$ 380,468	$ 334,861