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Summary of Significant Accounting Policies Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 212,457 | $ 172,497 | $ 358,985 | $ 307,330
Total operating revenue | 213,123 | 175,484 | 360,860 | 301,047
Total non-regulated revenue | 5,374 | 4,208 | 10,946 | 8,035
Regulated Water and WasteWater Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 212,457 | 172,497 | 358,985 | 307,330
Regulatory balancing account revenue | 666 | 2,987 | 1,875 | (6,283)
Total operating revenue | 213,123 | 175,484 | 360,860 | 301,047
Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 134,971 | 116,453 | 236,342 | 208,998
Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 35,730 | 28,531 | 63,452 | 56,223
Industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 6,019 | 6,622 | 12,062 | 14,500
Public authorities |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 10,358 | 7,711 | 16,760 | 13,608
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 25,379 | 13,180 | 30,369 | 14,001
Operating and maintenance revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 3,925 | 2,789 | 8,013 | 5,288
Other non-regulated revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 796 | 834 | 1,655 | 1,599
Non-Regulated Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 4,721 | 3,623 | 9,668 | 6,887
Lease revenue | 653 | 585 | 1,278 | 1,148
Total non-regulated revenue | $ 5,374 | $ 4,208 | $ 10,946 | $ 8,035

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