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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, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Trade accounts receivable |  |  |  |
Trade accounts receivable - gross |  | $ 178,829 |  | $ 197,546
Allowance for credit losses |  | (7,560) |  | (6,541)
Trade accounts receivable - net | [1] | 171,269 |  | 191,005
Unbilled receivables |  | 51,408 |  | $ 43,673
Changes in allowance for credit losses |  |  |  |
Balance, beginning of year |  | 6,541 | $ 4,182 |
Bad debt expense |  | 2,960 | 1,466 |
Write-offs and other |  | (1,941) | (824) |
Balance, end of period |  | $ 7,560 | $ 4,824 |
[1] | Includes unbilled receivables of $51,408 as of March 31, 2024 and $43,673 as of December 31, 2023.

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