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Investments in Unconsolidated Affiliates (Tables) | 12 Months Ended
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Dec. 31, 2023
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, 2021 | ​ | $ | 565,437 | ​ | ​ | 130,572 | ​ | ​ | 696,009 | ​
Equity in earnings of unconsolidated affiliates (1) | ​ | ​ | 86,660 | ​ | ​ | 7,558 | ​ | ​ | 94,218 | ​
Distributions from unconsolidated affiliates | ​ | ​ | (108,445) | ​ | ​ | (12,015) | ​ | ​ | (120,460) | ​
Return of investment in unconsolidated affiliate | ​ | ​ | (17,000) | ​ | ​ | — | ​ | ​ | (17,000) | ​
Balance as of December 31, 2022 | ​ | ​ | 526,652 | ​ | ​ | 126,115 | ​ | ​ | 652,767 | ​
Additional investments | ​ | ​ | — | ​ | ​ | 262 | ​ | ​ | 262 | ​
Equity in earnings of unconsolidated affiliates (1) | ​ | ​ | 98,194 | ​ | ​ | 7,262 | ​ | ​ | 105,456 | ​
Distributions from unconsolidated affiliates | ​ | ​ | (116,025) | ​ | ​ | (15,810) | ​ | ​ | (131,835) | ​
Balance as of December 31, 2023 | ​ | $ | 508,821 | ​ | ​ | 117,829 | ​ | ​ | 626,650 | ​
(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 Stonewall and the Joint Venture as of March 12, 2019.
Combined Balance Sheets
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​
(in thousands) |  | 2022 | ​ | 2023 | ​
Current assets | ​ | $ | 74,852 | ​ | ​ | 68,894 | ​
Noncurrent assets | ​ | ​ | 1,517,349 | ​ | ​ | 1,460,004 | ​
Total assets | ​ | $ | 1,592,201 | ​ | ​ | 1,528,898 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current liabilities | ​ | $ | 5,453 | ​ | ​ | 7,711 | ​
Noncurrent liabilities | ​ | ​ | 4,427 | ​ | ​ | 4,028 | ​
Noncontrolling interest | ​ | ​ | 154,100 | ​ | ​ | 146,094 | ​
Partners' capital | ​ | ​ | 1,428,221 | ​ | ​ | 1,371,065 | ​
Total liabilities and partners' capital | ​ | $ | 1,592,201 | ​ | ​ | 1,528,898 | ​
​ Statements of Combined Operations
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, | ​
(in thousands) |  | 2021 |  | 2022 |  | 2023 | ​
Revenues | ​ | $ | 333,565 | ​ | ​ | 357,730 | ​ | ​ | 388,717 | ​
Operating expenses | ​ | ​ | 130,080 | ​ | ​ | 153,383 | ​ | ​ | 156,678 | ​
Income from operations | ​ | ​ | 203,485 | ​ | ​ | 204,347 | ​ | ​ | 232,039 | ​
Net income attributable to unconsolidated affiliates, including noncontrolling interest | ​ | ​ | 236,444 | ​ | ​ | 248,458 | ​ | ​ | 269,471 | ​
Net income attributable to unconsolidated affiliates | ​ | ​ | 245,256 | ​ | ​ | 257,458 | ​ | ​ | 278,545 | ​
​

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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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