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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, 2021 | Mar. 31, 2020
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 146,528 | $ 134,833
Total operating revenue | 147,737 | 125,563
Total non-regulated revenue | 5,572 | 3,827
Regulated Water and WasteWater Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 146,528 | 134,833
Regulatory balancing account revenue | 1,209 | (9,270)
Total operating revenue | 147,737 | 125,563
Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 101,371 | 92,544
Business |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 27,721 | 27,693
Industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 6,043 | 7,878
Public authorities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 6,403 | 5,897
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 4,990 | 821
Operating and maintenance revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 4,087 | 2,499
Other non-regulated revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 860 | 765
Non-Regulated Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 4,947 | 3,264
Lease Income | 625 | 563
Total non-regulated revenue | $ 5,572 | $ 3,827

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