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SUPPLEMENTAL BALANCE SHEET AND CASH FLOW INFORMATION (trade accounts receivable) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Trade accounts receivable |  |  |  |
Trade accounts receivable - gross |  | $ 202,077 | $ 168,387 |
Allowance for uncollectible accounts |  | (4,130) | (6,428) | $ (4,985)
Trade accounts receivable - net | [1] | 197,947 | 161,959 |
Unbilled receivables |  | 47,420 | 21,319 |
Changes in allowances for uncollectible accounts |  |  |  |
Balance, beginning of year |  | 6,428 | 4,985 | 3,639
Bad debt expense |  | 223 | 5,003 | 5,213
Write-offs and other |  | (2,521) | (3,560) | (3,867)
Balance, end of year |  | $ 4,130 | $ 6,428 | $ 4,985
[1] | Includes unbilled receivables of $47,420 as of December 31, 2021 and $21,319 as of December 31, 2020.

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