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Acquisition (Details) people in Thousands, $ in Thousands | Jun. 01, 2020 USD ($) customerConnection waterSystem people | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 31,132 | $ 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 |  |
Rainier View Water Company |  |  |
Business Acquisition [Line Items] |  |  |
Payments to Acquire Businesses, Gross | $ 37,700 |  |
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 | 21,200 |  |
Goodwill | $ 28,500 |  |

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