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Details of Selected Balance Sheet Accounts - Accounts Receivable (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	$ 178,122	$ 171,439
Allowance for doubtful accounts	(7,698)	(8,304)
Accounts receivable, net	$ 170,424	$ 163,135
Allowance for doubtful accounts as a percentage of total accounts receivable	4.00%	5.00%
Trade
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	$ 125,332	$ 109,294
Unbilled revenue
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	23,813	23,173
Contract assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	18,074	35,870
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	$ 10,903	$ 3,102

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- Definition

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

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