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Utility Plant Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets | The costs of intangible assets as of December 31, 2021 and 2020 are as follows:
| 2021 |  | 2020
Concession fees | $ | 6,800 |  |  | 6,800 |
Purchase premium customer relationships | 13,400 |  |  | 13,400 |
Other intangibles | 16,076 |  |  | 14,967 |
Intangible assets | 36,276 |  |  | 35,167 |
Less: Accumulated amortization |  |  |
Concession fees | 6,596 |  |  | 6,324 |
Purchase premium customer relationships | 1,988 |  |  | 1,094 |
Other intangibles | 7,042 |  |  | 6,479 |
Net intangible assets | $ | 20,650 |  |  | 21,270 |

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