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Supplemental balance sheet and cash flow information (trade accounts receivable, allowance for credit losses) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Trade accounts receivable
Trade accounts receivable - gross		$ 188,534		$ 202,077
Allowance for credit losses		(4,199)		(4,130)
Trade accounts receivable - net	[1]	184,335		197,947
Unbilled receivables		50,106		$ 47,420
Accounts receivable, allowance for credit losses [Roll Forward]
Balance, beginning of year		4,130	$ 6,428
Bad debt expense (benefit)		625	(649)
Write-offs and other		(556)	(900)
Balance, end of period		$ 4,199	$ 4,879
[1] Includes unbilled receivables of $50,106 as of March 31, 2022 and $47,420 as of December 31, 2021.

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