Stock-Based Compensation - Compensation Expense Allocation (Details) - Polaris Plan $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 405,843
Cost of services
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	163,025
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 242,818