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Variable Interest Entities (Tables) | 9 Months Ended
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Sep. 30, 2025
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] |
Schedule of assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31, | ​
​ | ​ | 2025 |  | 2024 | ​
Assets (liabilities): |  | (in thousands) |
Cash and cash equivalents | ​ | $ | 4,266 | ​ | $ | 5,154 | ​
Trade receivables | ​ |  | 12,587 | ​ |  | 11,209 | ​
Total property, plant and equipment, net | ​ |  | 360,758 | ​ |  | 373,093 | ​
Accounts payable | ​ | ​ | (240) | ​ | ​ | (221) | ​
Due to affiliates | ​ |  | (113) | ​ | ​ | — | ​
Accrued taxes other than income taxes | ​ |  | (878) | ​ | ​ | (870) | ​

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- Definition Tabular disclosure of condensed balance sheet, including, but not limited to, balance sheets of consolidated entities and consolidation eliminations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 04 -Paragraph a -Publisher SEC Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3 + Details
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