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Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 314,096 | $ 306,237 | $ 753,013 | $ 687,803
Regulatory balancing account revenue | (2,861) | (6,674) | 27,149 | 126,808
Total operating revenue | 311,235 | 299,563 | 780,162 | 814,611
Total non-regulated revenue | 5,349 | 4,133 | 15,341 | 14,744
Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 186,699 | 184,951 | 434,061 | 399,695
Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 56,284 | 56,225 | 144,926 | 132,680
Multiple residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 22,766 | 21,795 | 62,692 | 56,707
Industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 11,098 | 9,645 | 24,032 | 23,404
Public authorities |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 19,039 | 18,140 | 41,295 | 36,020
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 18,210 | 15,481 | 46,007 | 39,297
Contract operating and maintenance revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 3,546 | 3,384 | 10,052 | 9,820
Other non-regulated revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,218 | 143 | 3,557 | 3,092
Non-regulated revenue from contracts with customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 4,764 | 3,527 | 13,609 | 12,912
Lease revenue | 585 | 606 | 1,732 | 1,832
Total non-regulated revenue | $ 5,349 | $ 4,133 | $ 15,341 | $ 14,744

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