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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, 2025	Mar. 31, 2024	Dec. 31, 2024
Trade accounts receivable
Trade accounts receivable - gross		$ 182,837		$ 183,196
Allowance for credit losses		(9,147)		(9,120)
Trade accounts receivable - net	[1]	173,690		174,076
Unbilled receivables		59,785		$ 47,341
Changes in allowance for credit losses
Balance, beginning of year		9,120	$ 6,541
Bad debt expense		1,770	2,960
Write-offs and other		(1,743)	(1,941)
Balance, end of period		$ 9,147	$ 7,560
[1] Includes unbilled receivables of $59,785 as of March 31, 2025 and $47,341 as of December 31, 2024.

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