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Intangible Assets | 12 Months Ended
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Dec. 31, 2022
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 |  | 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 |
Amortization expense for intangible assets was $3.7 million and $3.6 million in 2022 and 2021, respectively. Expected annual amortization expense of the coal supply agreement is $3.2 million in 2023, $3.1 million in 2024 and $3.0 million in 2025 through 2027.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI https://asc.fasb.org/topic&trid=2144416 + Details
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