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Acquisition (Details) people in Thousands, $ in Thousands | Sep. 25, 2020 USD ($) a | Jun. 01, 2020 USD ($) customerConnection people waterSystem | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill |  |  | $ 31,842 | $ 2,615
Rainier View Water Company |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of people served | people |  | 35 |  |
Number of customer connections | customerConnection |  | 18,500 |  |
Water systems | waterSystem |  | 27 |  |
Kalaeloa Water Company |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Area of Land | a | 3,700 |  |  |
Rainier View Water Company |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash paid |  | $ 37,600 |  |
Assets acquired and liabilities assumed |  | 32,600 |  |
Assets acquired and liabilities assumed, property, plant, and equipment |  | 31,100 |  |
Recognized identifiable assets acquired and liabilities assumed, liabilities |  | 23,500 |  |
Recognized identifiable assets acquired and liabilities assumed, aid for construction |  | 21,300 |  |
Goodwill |  | $ 28,500 |  |
Kalaeloa Water Company |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash paid | $ 3,100 |  |  |
Assets acquired and liabilities assumed | 2,800 |  |  |
Assets acquired and liabilities assumed, property, plant, and equipment | 2,100 |  |  |
Recognized identifiable assets acquired and liabilities assumed, liabilities | 400 |  |  |
Goodwill | $ 700 |  |  |

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