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Utility Plant Intangible Assets Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 1997 | Jan. 08, 2020
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets | $ 35,167 | $ 33,424 |  |  |
Purchase premium customer relationships | 13,400 | 13,400 |  |  |
Amortization of Intangible Assets | 1,401 | 745 | $ 647 |  |
Future Amortization of Intangible Assets |  |  |  |  |
2021 | 1,401 |  |  |  |
2022 | 1,401 |  |  |  |
2023 | 1,401 |  |  |  |
2024 | 1,401 |  |  |  |
2025 | 1,401 |  |  |  |
Thereafter | 1,401 |  |  |  |
Concession fees |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets | 6,800 | 6,800 |  |  | $ 5,000
Other intangibles |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets | 14,967 | $ 13,224 |  |  |
Service Agreements |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets | 3,999 |  |  |  |
Useful life of intangible assets |  |  |  | 25 years |
Infrastructure |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets | 5,984 |  |  |  |
Customer Relationships |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets | 1,400 |  |  |  |
Contractual Rights |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets | $ 1,040 |  |  |  |
Minimum |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Useful life of intangible assets | 5 years |  |  |  |
Maximum |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Useful life of intangible assets | 70 years |  |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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