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Investments in Unconsolidated Affiliates (Tables) | 9 Months Ended
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Sep. 30, 2025
Investments in Unconsolidated Affiliates |
Schedule of reconciliation of investments in unconsolidated affiliates | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Total Investment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | in Unconsolidated | ​
(in thousands) |  | Joint Venture |  | Stonewall |  | Affiliates | ​
Balance as of December 31, 2024 | ​ | $ | 490,365 | ​ | ​ | 113,591 | ​ | ​ | 603,956 | ​
Additional investments | ​ | ​ | — | ​ | ​ | 6,653 | ​ | ​ | 6,653 | ​
Equity in earnings of unconsolidated affiliates (1) | ​ | ​ | 81,108 | ​ | ​ | 6,616 | ​ | ​ | 87,724 | ​
Distributions from unconsolidated affiliates | ​ | ​ | (94,575) | ​ | ​ | (11,520) | ​ | ​ | (106,095) | ​
Balance as of September 30, 2025 | ​ | $ | 476,898 | ​ | ​ | 115,340 | ​ | ​ | 592,238 | ​
(1) | As adjusted for the amortization of the difference between the cost of the equity investments in Stonewall and the Joint Venture and the amount of the underlying equity in the net assets of the Joint Venture and Stonewall as of March 12, 2019.

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 + Details
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