Description of Business and Summary of Significant Accounting Policies - Accounts Receivables and Allowances (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 161,099		$ 161,099		$ 153,609
Allowance for doubtful accounts	20,312		20,312		19,874
Provision for doubtful accounts	2,100	$ (755)	1,702	$ (2,815)
Billed Revenues
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	161,100		161,100		153,600
Unbilled Revenues
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 51,600		$ 51,600		$ 50,100