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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2025
Income Taxes |
Schedule of income before income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(in thousands) | ​ | 2025 | ​ ​ ​ | 2024 | ​ ​ ​ | 2023
U.S. | ​ ​ ​ ​ ​ | $ | 423,638 | ​ ​ ​ ​ ​ | $ | 232,380 | ​ ​ ​ ​ ​ | $ | 142,247
Foreign | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Total | ​ | $ | 423,638 | ​ | $ | 232,380 | ​ | $ | 142,247
Schedule of provision for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(in thousands) | ​ ​ ​ | 2025 | ​ ​ ​ | 2024 | ​ ​ ​ | 2023
Current tax provision: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. federal | ​ | $ | 424 | ​ | $ | — | ​ | $ | —
State | ​ |  | 2,630 | ​ |  | 2,059 | ​ |  | 1,591
Total current | ​ | ​ | 3,054 | ​ | ​ | 2,059 | ​ | ​ | 1,591
Deferred tax provision: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. federal | ​ | ​ | 91,880 | ​ | ​ | 53,340 | ​ | ​ | 32,928
State | ​ |  | 5,911 | ​ |  | 4,750 | ​ |  | 2,730
Total deferred | ​ | ​ | 97,791 | ​ | ​ | 58,090 | ​ | ​ | 35,658
Provision for income taxes | ​ | $ | 100,845 | ​ | $ | 60,149 | ​ | $ | 37,249
Schedule of Income taxes paid, net | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(in thousands) | ​ | 2025 | ​ | 2024 | ​ | 2023
U.S. Federal | ​ ​ ​ | $ | 1,145 | ​ ​ ​ | $ | 350 | ​ ​ ​ | $ | —
State | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Texas | ​ |  | 1,706 | ​ |  | 1,204 | ​ |  | 1,020
New Mexico | ​ |  | 193 | ​ |  | 162 | ​ |  | —
Pennsylvania | ​ | ​ | 109 | ​ | ​ | 190 | ​ | ​ | 220
Louisiana | ​ | ​ | 40 | ​ | ​ | 180 | ​ | ​ | 30
Other | ​ |  | 97 | ​ |  | 124 | ​ |  | 41
Total income taxes paid, net | ​ | $ | 3,290 | ​ | $ | 2,210 | ​ | $ | 1,311
Reconciliation of effective tax rates to the U.S. statutory rate | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, | ​
(in thousands) | ​ | 2025 | ​ | ​ | 2024 | ​ | ​ | 2023 | ​
U.S. Federal statutory tax rate | ​ ​ ​ | $ | 88,964 | ​ ​ ​ | 21.0 | % | ​ | $ | 48,800 | ​ ​ ​ | 21.0 | % | ​ | $ | 29,872 | ​ | 21.0 | %
State and local income taxes, net of federal income tax effect (1) | ​ |  | 6,907 | ​ | 1.6 | ​ | ​ |  | 5,425 | ​ | 2.3 | ​ | ​ |  | 3,550 | ​ | 2.5 | ​
Changes in valuation allowance (2) | ​ |  | (70) | ​ | 0.0 | ​ | ​ |  | 257 | ​ | 0.1 | ​ | ​ |  | 634 | ​ | 0.4 | ​
Nontaxable or nondeductible items | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Executive compensation limitation | ​ | ​ | 9,455 | ​ | 2.2 | ​ | ​ | ​ | 7,146 | ​ | 3.1 | ​ | ​ | ​ | 3,470 | ​ | 2.4 | ​
Benefit from equity-settled long-term incentive compensation | ​ | ​ | (5,801) | ​ | (1.4) | ​ | ​ | ​ | (1,569) | ​ | (0.7) | ​ | ​ | ​ | (213) | ​ | (0.1) | ​
Other | ​ | ​ | 1,148 | ​ | 0.3 | ​ | ​ | ​ | (139) | ​ | (0.1) | ​ | ​ | ​ | (182) | ​ | (0.1) | ​
Changes in unrecognized tax benefits(3) | ​ |  | 242 | ​ | 0.1 | ​ | ​ |  | 229 | ​ | 0.1 | ​ | ​ |  | 118 | ​ | 0.1 | ​
Effective tax rate | ​ | $ | 100,845 | ​ | 23.8 | % | ​ | $ | 60,149 | ​ | 25.9 | % | ​ | $ | 37,249 | ​ | 26.2 | %
(1) | During the years ended December 31, 2025 and 2024, state taxes in New Mexico made up greater than 50% of the tax effect in this category. During the year ended December 31, 2023, state taxes in New Mexico and Texas made up greater than 50% of the tax effect in this category.
(2) | See “Tax Attributes and Valuation Allowances” below for further details.
(3) | Includes the expiration of statute of limitations. See “Unrecognized Tax Benefits” below for further details.
Schedule of deferred income tax balances | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(in thousands) | ​ | 2025 | ​ | 2024
Deferred tax assets: | ​ ​ ​ | ​ | ​ | ​ ​ ​ | ​ | ​
Net operating loss carryforwards | ​ | $ | 147,123 | ​ | $ | 143,412
Interest expense limitation carryforward | ​ |  | 25,420 | ​ |  | 41,555
Basis difference in unconsolidated affiliate | ​ | ​ | 872 | ​ | ​ | 943
Goodwill and intangible assets | ​ | ​ | 24,255 | ​ | ​ | 40,201
Accrued liabilities | ​ |  | 8,329 | ​ |  | 8,351
Other | ​ |  | 11,934 | ​ |  | 12,822
​ | ​ | ​ | 217,933 | ​ | ​ | 247,284
Valuation allowances (1) | ​ |  | (1,441) | ​ |  | (1,462)
Total deferred tax assets | ​ | ​ | 216,492 | ​ | ​ | 245,822
​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax liabilities: | ​ |  | ​ | ​ |  | ​
Property, plant and equipment | ​ | ​ | (159,165) | ​ | ​ | (78,477)
Basis difference in partnership | ​ |  | (245,941) | ​ |  | (221,149)
Other | ​ |  | (7,636) | ​ |  | (5,726)
Total deferred tax liabilities | ​ |  | (412,742) | ​ |  | (305,352)
​ | ​ | ​ | ​ | ​ | ​ | ​
Net deferred tax liability (2) | ​ | $ | (196,250) | ​ | $ | (59,530)
(1) | See “Tax Attributes and Valuation Allowances” below for further details.
(2) | The net deferred tax liability as of December 31, 2025 and 2024 is reflected in our consolidated balance sheets as deferred tax assets of $2.1 million and $3.0 million, respectively, and deferred tax liabilities of $198.3 million and $62.5 million, respectively.
Schedule of changes in valuation allowance | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(in thousands) | ​ | 2025 | ​ ​ ​ | 2024 | ​ ​ ​ | 2023
Balance at beginning of period | ​ ​ ​ ​ ​ | $ | (1,462) | ​ ​ ​ ​ ​ | $ | (1,177) | ​ ​ ​ ​ ​ | $ | (607)
Additions to valuation allowance | ​ | ​ | (141) | ​ | ​ | (455) | ​ | ​ | (742)
Reductions to valuation allowance | ​ | ​ | 162 | ​ | ​ | 170 | ​ | ​ | 172
Balance at end of period | ​ | $ | (1,441) | ​ | $ | (1,462) | ​ | $ | (1,177)
Schedule of changes in unrecognized tax benefits | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(in thousands) | ​ | 2025 | ​ ​ ​ | 2024 | ​ ​ ​ | 2023
Beginning balance | ​ ​ ​ | $ | 19,467 | ​ ​ ​ | $ | 19,465 | ​ ​ ​ | $ | 19,651
Additions based on tax positions related to current year | ​ |  | 2,558 | ​ |  | 2,402 | ​ |  | 1,886
Additions based on tax positions related to prior years | ​ |  | 11,637 | ​ |  | — | ​ |  | —
Reductions based on tax positions related to prior years | ​ |  | — | ​ |  | (18) | ​ |  | (7)
Reductions based on lapse of statute of limitations | ​ |  | (2,372) | ​ |  | (2,382) | ​ |  | (2,065)
Ending balance | ​ | $ | 31,290 | ​ | $ | 19,467 | ​ | $ | 19,465

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