| Schedule of Property, Plant and Equipment |
Property, plant and equipment, net include the following (in thousands): | | | | | | | | | | | | | | | | | | | | | December 31, | | Useful Life | | 2025 | | 2024 | | Machinery and equipment | 7-20 years | | $ | 53,774 | | | $ | 114,366 | | Aviation equipment(a) | 3-10 years | | 43,498 | | | 3,742 | | | Buildings and leasehold improvements | 15-39 years | | 30,100 | | | 38,039 | | | Drilling rigs and directional drilling equipment | 3-15 years | | 13,062 | | | 96,120 | | | Vehicles, trucks and trailers | 5-10 years | | 13,044 | | | 19,716 | | | | | | | | | Rail improvements | 10-20 years | | 11,759 | | | 13,445 | | | | | | | | | Land | N/A | | 6,025 | | | 11,679 | | | | | | | | | Other property, plant and equipment | 3-15 years | | 6,721 | | | 17,305 | | | | | 177,983 | | | 314,412 | | | Equipment not yet placed in service | | | 25,970 | | | 3,094 | | | | | 203,953 | | | 317,506 | | Less: Accumulated depreciation(b) | | | 97,856 | | | 250,855 | | | Total property, plant and equipment, net | | | $ | 106,097 | | | $ | 66,651 | |
a.This equipment relates to assets leased to customers under operating leases. b.Includes accumulated depreciation of $5.7 million and $2.7 million at December 31, 2025 and 2024, respectively, related to assets under operating leases.
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| Schedule of Depreciation, Depletion, Accretion and Amortization Expense |
A summary of depreciation, depletion, amortization and accretion is shown below (in thousands): | | | | | | | | | | | | | | | | | | | Years Ended December 31, | | | 2025 | | 2024 | | | | Depreciation expense | | $ | 8,669 | | | $ | 10,245 | | | | | Depletion and accretion expense | | 1,568 | | | 1,415 | | | | | Amortization expense | | 55 | | | 55 | | | | | Depreciation, depletion, amortization and accretion | | $ | 10,292 | | | $ | 11,715 | | | |
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