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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, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Trade accounts receivable |  |  |  |
Trade accounts receivable - gross |  | $ 183,466 |  | $ 197,546
Allowance for credit losses |  | (11,206) |  | (6,541)
Trade accounts receivable - net | [1] | 172,260 |  | 191,005
Unbilled receivables |  | 61,416 |  | $ 43,673
Changes in allowance for credit losses |  |  |  |
Balance, beginning of year |  | 6,541 | $ 4,182 |
Bad debt expense |  | 12,040 | 5,191 |
Write-offs and other |  | (7,375) | (2,774) |
Balance, end of period |  | $ 11,206 | $ 6,599 |
[1] | Includes unbilled receivables of $61,416 as of September 30, 2024 and $43,673 as of December 31, 2023.

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