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BUSINESS SEGMENT INFORMATION - Summarized financial information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Revenues: |  |  |  |  |
Revenues | $ 364,153 | $ 415,858 | $ 741,986 | $ 892,526 |
Operating income: |  |  |  |  |
Total operating income | 35,468 | 82,369 | 67,817 | 173,026 |
Pension settlement charges |  | 911 |  | 18,286 |
Gain on disposition of assets, net | 3,338 | 3,015 | 4,552 | 5,951 |
Interest expense | (99) | (73) | (333) | (145) |
Interest income | 3,343 | 2,698 | 6,308 | 4,553 |
Other income, net | 732 | 631 | 1,499 | 1,392 |
Income before income taxes | 39,444 | 85,625 | 75,291 | 178,826 |
Depreciation and amortization | 32,333 | 26,203 | 62,337 | 50,328 |
Capital expenditures |  |  | 127,799 | 104,488 |
Identifiable assets | 1,325,246 | 1,228,188 | 1,325,246 | 1,228,188 | $ 1,286,845
Technical Services |  |  |  |  |
Revenues: |  |  |  |  |
Revenues | 341,484 | 390,018 | 697,878 | 842,009 |
Support Services |  |  |  |  |
Revenues: |  |  |  |  |
Revenues | 22,669 | 25,840 | 44,108 | 50,517 |
Corporate expenses |  |  |  |  |
Operating income: |  |  |  |  |
Corporate Expense | (2,447) | (4,672) | (6,867) | (9,753) |
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] |  |  |  |  |
Operating income: |  |  |  |  |
Pension settlement charges |  | 911 |  | 18,286 |
Gain on disposition of assets, net | 3,338 | 3,015 | 4,552 | 5,951 |
Depreciation and amortization |  |  | 38 | 25 |
Capital expenditures |  |  | 1,662 | 1,886 |
Identifiable assets | 329,453 | 286,379 | 329,453 | 286,379 |
Operating segments |  |  |  |  |
Revenues: |  |  |  |  |
Revenues | 364,153 | 415,858 | 741,986 | 892,526 |
Operating income: |  |  |  |  |
Total operating income | 35,468 | 82,369 | 67,817 | 173,026 |
Interest expense | (99) | (73) | (333) | (145) |
Interest income | 3,343 | 2,698 | 6,308 | 4,553 |
Other income, net | 732 | 631 | 1,499 | 1,392 |
Income before income taxes | 39,444 | 85,625 | 75,291 | 178,826 |
Operating segments | Technical Services |  |  |  |  |
Revenues: |  |  |  |  |
Revenues | 341,484 | 390,018 | 697,878 | 842,009 |
Operating income: |  |  |  |  |
Total operating income | 30,198 | 77,017 | 62,154 | 180,550 |
Depreciation and amortization |  |  | 56,522 | 45,580 |
Capital expenditures |  |  | 115,217 | 97,317 |
Identifiable assets | 914,418 | 853,837 | 914,418 | 853,837 |
Operating segments | Support Services |  |  |  |  |
Revenues: |  |  |  |  |
Revenues | 22,669 | 25,840 | 44,108 | 50,517 |
Operating income: |  |  |  |  |
Total operating income | 4,379 | 7,920 | 7,978 | 14,564 |
Depreciation and amortization |  |  | 5,777 | 4,723 |
Capital expenditures |  |  | 10,920 | 5,285 |
Identifiable assets | $ 81,375 | $ 87,972 | $ 81,375 | $ 87,972 |

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