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BUSINESS SEGMENT AND ENTITY WIDE DISCLOSURES - Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Segment information: |  |  |  |
Number of reportable segment not disclosed |  |  | true |
Revenues: |  |  |  |
Revenues | $ 460,869 | $ 420,809 | $ 915,624 | $ 753,686
Selling, general and administrative expenses | 51,523 | 40,825 | 99,730 | 83,324
Segment depreciation and amortization | 42,982 | 42,347 | 85,836 | 77,970
Acquisition related employment costs | 7,291 | 6,554 | 14,583 | 6,554
Gain on disposition of assets, net | (1,416) | (2,199) | (3,219) | (3,725)
Operating income | 14,771 | 15,536 | 17,391 | 27,922
Operating segments |  |  |  |
Revenues: |  |  |  |
Revenues | 460,869 | 420,809 | 915,624 | 753,686
Employment costs | 105,314 | 102,864 | 208,880 | 185,453
Materials and supplies | 132,975 | 111,953 | 282,457 | 187,262
Maintenance & repairs | 54,982 | 52,979 | 105,682 | 101,062
Fleet and transportation | 20,279 | 14,141 | 40,008 | 25,097
Other cost of revenues | 32,168 | 35,809 | 64,276 | 62,767
Cost of revenues (exclusive of depreciation and amortization) | 345,718 | 317,746 | 701,303 | 561,641
Employment costs | 20,396 | 18,126 | 39,809 | 35,667
Enterprise shared services | 10,102 | 9,702 | 20,140 | 20,030
Other selling, general and administrative expenses | 11,840 | 7,146 | 22,346 | 15,991
Selling, general and administrative expenses | 42,338 | 34,974 | 82,295 | 71,688
Segment depreciation and amortization | 42,961 | 42,327 | 85,795 | 77,931
Operating income | 29,852 | 25,762 | 46,231 | 42,426
Operating segments | Technical Services |  |  |  |
Revenues: |  |  |  |
Revenues | 438,115 | 396,754 | 872,397 | 708,598
Employment costs | 99,975 | 97,550 | 198,250 | 174,886
Materials and supplies | 132,061 | 110,998 | 280,547 | 185,467
Maintenance & repairs | 52,102 | 50,055 | 99,671 | 95,516
Fleet and transportation | 19,292 | 13,458 | 38,165 | 23,609
Other cost of revenues | 30,968 | 34,484 | 61,940 | 60,316
Cost of revenues (exclusive of depreciation and amortization) | 334,398 | 306,545 | 678,573 | 539,794
Employment costs | 17,622 | 15,498 | 34,429 | 30,550
Enterprise shared services | 9,645 | 9,286 | 19,237 | 19,145
Other selling, general and administrative expenses | 10,051 | 6,455 | 19,071 | 13,873
Selling, general and administrative expenses | 37,318 | 31,239 | 72,737 | 63,568
Segment depreciation and amortization | 38,837 | 37,847 | 77,547 | 70,110
Operating income | 27,562 | 21,123 | 43,540 | 35,126
Operating segments | Support Services |  |  |  |
Revenues: |  |  |  |
Revenues | 22,754 | 24,055 | 43,227 | 45,088
Employment costs | 5,339 | 5,314 | 10,630 | 10,567
Materials and supplies | 914 | 955 | 1,910 | 1,795
Maintenance & repairs | 2,880 | 2,924 | 6,011 | 5,546
Fleet and transportation | 987 | 683 | 1,843 | 1,488
Other cost of revenues | 1,200 | 1,325 | 2,336 | 2,451
Cost of revenues (exclusive of depreciation and amortization) | 11,320 | 11,201 | 22,730 | 21,847
Employment costs | 2,774 | 2,628 | 5,380 | 5,117
Enterprise shared services | 457 | 416 | 903 | 885
Other selling, general and administrative expenses | 1,789 | 691 | 3,275 | 2,118
Selling, general and administrative expenses | 5,020 | 3,735 | 9,558 | 8,120
Segment depreciation and amortization | 4,124 | 4,480 | 8,248 | 7,821
Operating income | 2,290 | 4,639 | 2,691 | 7,300
Unallocated |  |  |  |
Revenues: |  |  |  |
Selling, general and administrative expenses | 9,185 | 5,851 | 17,435 | 11,636
Segment depreciation and amortization | 21 | 20 | 41 | 39
Unallocated corporate expenses | 9,206 | 5,871 | 17,476 | 11,675
Segment Reporting, Reconciling Item, Excluding Corporate Non segment |  |  |  |
Revenues: |  |  |  |
Acquisition related employment costs | 7,291 | 6,554 | 14,583 | 6,554
Gain on disposition of assets, net | $ (1,416) | $ (2,199) | $ (3,219) | $ (3,725)

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