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Supplemental balance sheet and cash flow information (trade accounts receivable, allowance for credit losses) (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Trade accounts receivable
Trade accounts receivable - gross		$ 198,685		$ 202,077
Allowance for credit losses		(3,534)		(4,130)
Trade accounts receivable - net	[1]	195,151		197,947
Unbilled receivables		51,941		$ 47,420
Changes in allowance for credit losses
Balance, beginning of year		4,130	$ 6,428
Bad debt expense (benefit)		2,410	(412)
Write-offs and other		(3,006)	(2,555)
Balance, end of period		$ 3,534	$ 3,461
[1] Includes unbilled receivables of $51,941 as of September 30, 2022 and $47,420 as of December 31, 2021.

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