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Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 306,237 | $ 253,337 | $ 687,803 | $ 592,768
Regulatory balancing account revenue | (6,674) | 1,639 | 126,808 | (12,648)
Total operating revenue | 299,563 | 254,976 | 814,611 | 580,120
Total non-regulated revenue | 4,133 | 4,535 | 14,744 | 13,643
Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 184,951 | 150,031 | 399,695 | 342,806
Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 56,225 | 47,707 | 132,680 | 117,527
Multiple residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 21,795 | 18,778 | 56,707 | 50,280
Industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 9,645 | 8,165 | 23,404 | 19,672
Public authorities |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 18,140 | 14,522 | 36,020 | 29,938
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 15,481 | 14,134 | 39,297 | 32,545
Operating and maintenance revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 3,384 | 2,918 | 9,820 | 9,229
Other non-regulated revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 143 | 972 | 3,092 | 2,553
Non-regulated revenue from contracts with customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 3,527 | 3,890 | 12,912 | 11,782
Lease revenue | 606 | 645 | 1,832 | 1,861
Total non-regulated revenue | $ 4,133 | $ 4,535 | $ 14,744 | $ 13,643

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