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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, 2025	Sep. 30, 2024	Dec. 31, 2024
Trade accounts receivable
Trade accounts receivable - gross	[1]	$ 199,497		$ 183,196
Allowance for credit losses		(9,564)		(9,120)
Trade accounts receivable - net		189,933		174,076
Unbilled receivables		62,011		$ 47,341
Changes in allowance for credit losses
Balance, beginning of year		9,120	$ 6,541
Bad debt expense		4,980	12,040
Write-offs and other		(4,536)	(7,375)
Balance, end of period		$ 9,564	$ 11,206
[1] Includes unbilled receivables of $62,011 as of September 30, 2025 and $47,341 as of December 31, 2024.

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