| Assets | — | — |
| Current assets | — | — |
| Cash and cash equivalents | 2.52a | 70.28a |
| Accounts receivable | 71.09a | 82.25a |
| Commodity derivative assets | 1.82a | 38.27a |
| Prepaid expenses and other current assets | 3.11a | 2.32a |
| Total current assets | 78.54a | 193.13a |
| Property and equipment | — | — |
| Oil and natural gas properties, at cost, using the successful efforts method of accounting, includes unproved properties of $973,028 and $890,338 at December 31, 2024 and 2023, respectively | 3,105.46a | 3,026.39a |
| Accumulated depreciation, depletion, amortization, and impairment | -1,973.46a | -1,961.9a |
| Oil and natural gas properties, net | 1,132a | 1,064.5a |
| Other property and equipment, net of accumulated depreciation of $14,551 and $14,163 at December 31, 2024 and 2023, respectively | 2.04a | 1.01a |
| Net property and equipment | 1,134.04a | 1,065.5a |
| Deferred charges and other long-term assets | 6.32a | 8.26a |
| Total assets | 1,218.91a | 1,266.88a |
| Liabilities, mezzanine equity, and equity | — | — |
| Current liabilities | — | — |
| Accounts payable | 5.95a | 6.27a |
| Accrued liabilities | 17.24a | 17a |
| Commodity derivative liabilities | 3.85a | 1.23a |
| Other current liabilities | 3.38a | 1.33a |
| Total current liabilities | 30.42a | 25.84a |
| Long-term liabilities | — | — |
| Credit facility | 25a | 0a |
| Accrued incentive compensation | 1.23a | 1.7a |
| Commodity derivative liabilities | 11.58a | 0.08a |
| Asset retirement obligations | 19.29a | 19.03a |
| Other long-term liabilities | 1.94a | 2.89a |
| Total liabilities | 89.47a | 49.54a |
| Mezzanine equity | — | — |
| Partners' equity - Series B cumulative convertible preferred units, 14,711 and 14,711 units outstanding at December 31, 2024 and 2023, respectively | 300.48a | 299.14a |
| Equity | — | — |
| Partners' equity - general partner interest | 0a | 0a |
| Partners' equity - common units, 210,695 and 209,991 units outstanding at December 31, 2024 and 2023, respectively | 828.96a | 918.21a |
| Total equity | 828.96a | 918.21a |
| Total liabilities, mezzanine equity, and equity | 1,218.91a | 1,266.88a |