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PROPERTY AND EQUIPMENT (Tables) | 6 Months Ended
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Jun. 30, 2026
PROPERTY AND EQUIPMENT |
Schedule of property and equipment, net | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | June 30, 2026 | ​ ​ ​ | December 31, 2025
​ | ​ | (in thousands)
Machinery and equipment | ​ | $ | 574,611 | ​ | $ | 561,560
Gathering and disposal infrastructure | ​ |  | 466,695 | ​ |  | 418,044
Pipelines | ​ | ​ | 262,302 | ​ | ​ | 226,303
Recycling facilities | ​ | ​ | 184,521 | ​ | ​ | 168,714
Buildings and leasehold improvements | ​ |  | 115,444 | ​ |  | 108,872
Land | ​ | ​ | 54,931 | ​ | ​ | 46,412
Computer equipment and software | ​ | ​ | 7,796 | ​ | ​ | 8,260
Vehicles and equipment | ​ |  | 5,335 | ​ |  | 7,247
Machinery and equipment - finance lease | ​ |  | 3,137 | ​ |  | 3,137
Office furniture and equipment | ​ |  | 1,208 | ​ |  | 1,213
Computer equipment and software - finance lease | ​ |  | 815 | ​ |  | 824
Construction in progress | ​ |  | 119,771 | ​ |  | 78,820
​ | ​ |  | 1,796,566 | ​ |  | 1,629,406
Less accumulated depreciation(1) | ​ |  | (770,358) | ​ |  | (717,223)
Total property and equipment, net | ​ | $ | 1,026,208 | ​ | $ | 912,183
| (1) | Includes $1.9 million and $1.6 million of accumulated depreciation related to finance leases as of June 30, 2026 and December 31, 2025, respectively.
Schedule of amortization and depreciation expenses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended June 30, | ​ | Six months ended June 30, | ​
​ | ​ ​ ​ | 2026 | ​ ​ ​ | 2025 | ​ | 2026 | ​ ​ ​ | 2025 | ​
​ | ​ | (in thousands) | ​
Category | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Depreciation expense from property and equipment | ​ | $ | 42,561 | ​ | $ | 37,376 | ​ | $ | 83,602 | ​ | $ | 71,420 | ​
Amortization expense from finance leases | ​ | ​ | 180 | ​ | ​ | 182 | ​ | ​ | 361 | ​ | ​ | 351 | ​
Amortization expense from intangible assets | ​ | ​ | 4,386 | ​ | ​ | 4,378 | ​ | ​ | 8,765 | ​ | ​ | 8,756 | ​
Accretion expense from asset retirement obligations | ​ | ​ | 1,307 | ​ | ​ | 1,036 | ​ | ​ | 2,569 | ​ | ​ | 2,045 | ​
Total depreciation, amortization and accretion | ​ | $ | 48,434 | ​ | $ | 42,972 | ​ | $ | 95,297 | ​ | $ | 82,572 | ​
​

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