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v3.25.3

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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