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Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 238,268 | $ 238,352 | $ 595,860 | $ 597,337
Regulatory balancing account revenue | 28,039 | 18,371 | 49,634 | 20,246
Operating revenue | 266,307 | 256,723 | 645,494 | 617,583
Total non-regulated revenue | 4,573 | 5,813 | 16,772 | 16,759
Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 140,585 | 147,407 | 348,965 | 354,971
Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 44,031 | 43,450 | 115,472 | 106,902
Multiple residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 17,333 | 16,904 | 48,343 | 45,682
Industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 8,086 | 7,347 | 20,174 | 19,409
Public authorities |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 13,441 | 14,126 | 31,310 | 30,886
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 14,792 | 9,118 | 31,596 | 39,487
Operating and maintenance revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 3,184 | 4,110 | 9,822 | 12,122
Other non-regulated revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 720 | 894 | 4,951 | 2,550
Non-regulated revenue from contracts with customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 3,904 | 5,004 | 14,773 | 14,672
Lease revenue | 669 | 809 | 1,999 | 2,087
Total non-regulated revenue | $ 4,573 | $ 5,813 | 16,772 | $ 16,759
Insurance Programs |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  |  | $ 2,700 |

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