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BUSINESS SEGMENT AND ENTITY WIDE DISCLOSURES - Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Revenues: |  |  |  |
Revenues | $ 420,809 | $ 364,153 | $ 753,686 | $ 741,986
Selling, general and administrative expenses | 40,825 | 37,406 | 83,324 | 77,491
Segment depreciation and amortization | 42,347 | 32,333 | 77,970 | 62,337
Acquisition related employment costs | 6,554 |  | 6,554 |
(Gain) on sale of assets | (2,199) | (3,338) | (3,725) | (4,552)
Operating income | 15,536 | 35,468 | 27,922 | 67,817
Operating segments |  |  |  |
Revenues: |  |  |  |
Revenues | 420,809 | 364,153 | 753,686 | 741,986
Employment costs | 102,864 | 82,766 | 185,453 | 165,105
Materials and supplies | 111,953 | 85,472 | 187,262 | 180,747
Maintenance & repairs | 52,979 | 53,305 | 101,062 | 106,407
Fleet and transportation | 14,141 | 12,696 | 25,097 | 31,323
Other cost of revenues | 35,809 | 28,045 | 62,767 | 55,311
Cost of revenues (exclusive of depreciation and amortization) | 317,746 | 262,284 | 561,641 | 538,893
Employment costs | 18,126 | 16,274 | 35,667 | 34,296
Enterprise shared services | 9,702 | 9,269 | 20,030 | 18,254
Other selling, general and administrative expenses | 8,844 | 10,267 | 17,689 | 18,944
Selling, general and administrative expenses | 36,672 | 35,810 | 73,386 | 71,494
Segment depreciation and amortization | 40,629 | 31,482 | 76,233 | 61,467
Operating income | 25,762 | 34,577 | 42,426 | 70,132
Operating segments | Technical Services |  |  |  |
Revenues: |  |  |  |
Revenues | 396,754 | 341,484 | 708,598 | 697,878
Employment costs | 97,550 | 77,617 | 174,886 | 154,769
Materials and supplies | 110,998 | 84,708 | 185,467 | 179,198
Maintenance & repairs | 50,055 | 50,654 | 95,516 | 100,960
Fleet and transportation | 13,458 | 11,918 | 23,609 | 29,753
Other cost of revenues | 34,484 | 26,202 | 60,316 | 52,211
Cost of revenues (exclusive of depreciation and amortization) | 306,545 | 251,099 | 539,794 | 516,891
Employment costs | 15,498 | 13,982 | 30,550 | 29,559
Enterprise shared services | 9,286 | 8,940 | 19,145 | 17,512
Other selling, general and administrative expenses | 7,058 | 8,645 | 14,476 | 15,972
Selling, general and administrative expenses | 31,842 | 31,567 | 64,171 | 63,043
Segment depreciation and amortization | 36,403 | 28,620 | 68,666 | 55,790
Operating income | 21,964 | 30,198 | 35,967 | 62,154
Operating segments | Support Services |  |  |  |
Revenues: |  |  |  |
Revenues | 24,055 | 22,669 | 45,088 | 44,108
Employment costs | 5,314 | 5,149 | 10,567 | 10,336
Materials and supplies | 955 | 764 | 1,795 | 1,549
Maintenance & repairs | 2,924 | 2,651 | 5,546 | 5,447
Fleet and transportation | 683 | 778 | 1,488 | 1,570
Other cost of revenues | 1,325 | 1,843 | 2,451 | 3,100
Cost of revenues (exclusive of depreciation and amortization) | 11,201 | 11,185 | 21,847 | 22,002
Employment costs | 2,628 | 2,292 | 5,117 | 4,737
Enterprise shared services | 416 | 329 | 885 | 742
Other selling, general and administrative expenses | 1,786 | 1,622 | 3,213 | 2,972
Selling, general and administrative expenses | 4,830 | 4,243 | 9,215 | 8,451
Segment depreciation and amortization | 4,226 | 2,862 | 7,567 | 5,677
Operating income | 3,798 | 4,379 | 6,459 | 7,978
Unallocated |  |  |  |
Revenues: |  |  |  |
Selling, general and administrative expenses | 4,153 | 1,596 | 9,938 | 5,997
Segment depreciation and amortization | 1,718 | 851 | 1,737 | 870
Unallocated corporate expenses | 5,871 | 2,447 | 11,675 | 6,867
Segment Reporting, Reconciling Item, Excluding Corporate Non segment |  |  |  |
Revenues: |  |  |  |
Acquisition related employment costs | 6,554 |  | 6,554 |
(Gain) on sale of assets | $ (2,199) | $ (3,338) | $ (3,725) | $ (4,552)

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