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Long-Term Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2025
Long-Term Incentive Plans |
Summary of the status of the non-vested phantom units | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Non-Vested Phantom Units | ​
​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | ​
​ | ​ | Service- | ​ | Performance- | ​ | Average | ​ | ​ | ​ |
​ | ​ | Based | ​ | Based | ​ | Grant Date | ​ | Fair Value |
​ | ​ | Awards | ​ | Awards | ​ | Fair Value ($) | ​ | (in thousands) |
Outstanding non-vested units at December 31, 2023 |  | 368,902 | ​ | 475,318 | ​ | 30.33 | ​ | $ | 25,602 | ​
Granted | ​ | 179,800 | ​ | 147,671 | ​ | 44.37 | ​ | ​ | 14,531 | ​
Vested |  | (137,213) | ​ | — | ​ | 31.63 | ​ | ​ | (4,340) | ​
Outstanding non-vested units at December 31, 2024 |  | 411,489 | ​ | 622,989 | ​ | 34.60 | ​ | $ | 35,793 | ​
Granted | ​ | 109,756 | ​ | 101,159 | ​ | 57.30 | ​ | ​ | 12,085 | ​
Vested |  | (292,383) | ​ | (258,386) | ​ | 30.62 | ​ | ​ | (16,863) | ​
Outstanding non-vested units at December 31, 2025 |  | 228,862 | ​ | 465,762 | ​ | 44.65 | ​ | $ | 31,015 | ​

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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