Prepaid Expenses and Other Current Assets - Deferred Cost (Details) - Commission and Incentive Payments - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Capitalized Contract Cost [Line Items]
Deferred costs associated with obtaining customer contracts	$ 70,707	$ 68,293
Other Current Assets
Capitalized Contract Cost [Line Items]
Deferred costs associated with obtaining customer contracts	45,009	41,955
Other Assets
Capitalized Contract Cost [Line Items]
Deferred costs associated with obtaining customer contracts	$ 25,698	$ 26,338