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v3.25.1

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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