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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue (Details ) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | $ 790,334 | $ 772,616 | $ 765,704
Regulatory balancing account revenue | 4,298 | 73,815 | 25,205
Operating revenue | 794,632 | 846,431 | 790,909
Non-regulated revenue | 18,509 | 21,276 | 22,761
Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 463,417 | 458,448 | 467,365
Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 159,050 | 153,570 | 144,565
Multiple residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 67,703 | 64,481 | 61,478
Industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 28,055 | 26,622 | 26,569
Public authorities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 40,811 | 41,150 | 40,501
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 31,298 | 28,345 | 25,226
Operating and maintenance revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 12,499 | 12,860 | 16,276
Other non-regulated revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 3,506 | 5,774 | 3,741
Non-regulated revenue from contracts with customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 16,005 | 18,634 | 20,017
Lease revenue | 2,504 | 2,642 | 2,744
Non-regulated revenue | $ 18,509 | $ 21,276 | $ 22,761

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