Prepaid Expenses and Other Current Assets - Deferred Cost (Details) - Commission and Incentive Payments - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Capitalized Contract Cost [Line Items]
Deferred costs associated with obtaining customer contracts	$ 77,716	$ 70,707
Other Current Assets
Capitalized Contract Cost [Line Items]
Deferred costs associated with obtaining customer contracts	54,516	45,009
Other Assets
Capitalized Contract Cost [Line Items]
Deferred costs associated with obtaining customer contracts	$ 23,200	$ 25,698