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Utility Plant Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets | The costs of intangible assets as of December 31, 2020 and 2019 are as follows:
| 2020 |  | 2019
Concession fees | $ | 6,800 |  |  | 6,800 |
Purchase premium customer relationships | 13,400 |  |  | 13,400 |
Other intangibles | 14,967 |  |  | 13,224 |
Intangible assets | 35,167 |  |  | 33,424 |
Less: Accumulated amortization |  |  |
Concession fees | 6,324 |  |  | 6,052 |
Purchase premium customer relationships | 1,094 |  |  | 201 |
Other intangibles | 6,479 |  |  | 6,926 |
Net intangible assets | $ | 21,270 |  |  | 20,245 |

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