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Intangible Assets | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets The Company has a coal supply agreement intangible asset which is subject to amortization based on units of production over the term of the lignite sales agreement which expires in 2032. The gross and net balances are set forth in the following table:
| Gross Carrying Amount |  | Accumulated Amortization and Impairment |  | Net Balance
Balance at December 31, 2023 |  |  |  |  |
Coal supply agreement | $ | 84,200 |  |  | $ | (78,194) |  |  | $ | 6,006 |
Balance at December 31, 2022 |  |  |  |  |
Coal supply agreement | $ | 84,200 |  |  | $ | (56,145) |  |  | $ | 28,055 |
Amortization expense for intangible assets was $3.0 million and $3.7 million in 2023 and 2022, respectively. During the fourth quarter of 2023,the Company recorded a non-cash, long-lived asset impairment charge of $65.9 million. See Note 9 for further discussion of the impairment charge.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350/tableOfContent + Details
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