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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets | The gross and net balances are set forth in the following table:
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Balance
Balance at December 31, 2022 |  |  |  |  |
Coal supply agreement | $ | 84,200 |  |  | $ | (56,145) |  |  | $ | 28,055 |
Balance at December 31, 2021 |  |  |  |  |
Coal supply agreement | $ | 84,200 |  |  | $ | (52,426) |  |  | $ | 31,774 |

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