Description of Business and Summary of Significant Accounting Policies - Accounts Receivable and the Allowance for Doubtful Accounts Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, after allowance for credit loss, current	$ 153,609	$ 142,847
Allowance for doubtful accounts	19,874	22,691
(Benefit) provision for doubtful accounts	(2,334)	1,749	$ 12,325
Billed Revenues
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, after allowance for credit loss, current	103,300	97,600
Unbilled Revenues
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, after allowance for credit loss, current	$ 50,100	$ 45,200