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Details of Selected Balance Sheet Accounts - Accounts Receivable (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	$ 199,036	$ 190,551
Allowance for doubtful accounts	(4,779)	(4,471)
Accounts receivable, net	$ 194,257	$ 186,080
Allowance for doubtful accounts as a percentage of total accounts receivable	2.00%	2.00%
Trade
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	$ 124,692	$ 116,434
Unbilled revenue
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	24,368	24,389
Contract assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	39,937	39,755
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	$ 10,039	$ 9,973

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Accounts Receivable, Allowance For Credit Loss, Percentage Of Total Accounts Receivable

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