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Summary of Significant Accounting Policies Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 134,833 | $ 117,410
Total operating revenue | 125,563 | 126,111
Total non-regulated revenue | 3,827 | 4,901
Regulated Water and WasteWater Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 134,833 | 117,410
Regulatory balancing account revenue | (9,270) | 8,701
Total operating revenue | 125,563 | 126,111
Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 92,544 | 84,259
Business |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 27,693 | 25,481
Industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 7,878 | 7,264
Public authorities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 5,897 | 4,471
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 821 | (4,065)
Operating and maintenance revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,499 | 3,046
Other non-regulated revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 765 | 1,296
Non-Regulated Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 3,264 | 4,342
Lease Income | 563 | 559
Total non-regulated revenue | $ 3,827 | $ 4,901

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