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SUPPLEMENTAL BALANCE SHEET AND CASH FLOW INFORMATION (trade accounts receivable) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Trade accounts receivable |  |  |  |
Trade accounts receivable - gross | [1] | $ 197,546 | $ 210,799 |
Allowance for credit losses |  | (6,541) | (4,182) | $ (4,130)
Trade accounts receivable - net |  | 191,005 | 206,617 |
Unbilled receivables |  | 43,673 | 43,902 |
Changes in allowance for credit losses |  |  |  |
Balance, beginning of year |  | 4,182 | 4,130 | 6,428
Bad debt expense |  | 7,045 | 4,185 | 223
Write-offs and other |  | (4,686) | (4,133) | (2,521)
Balance, end of year |  | $ 6,541 | $ 4,182 | $ 4,130
[1] | Includes unbilled receivables of $43,673 as of December 31, 2023 and $43,902 as of December 31, 2022.

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