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Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers $ 145,225 $ 158,933
Regulatory balancing account revenue (14,125) 14,060
Operating revenue 131,100 172,993
Total non-regulated revenue 4,623 5,197
Residential    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 84,035 91,743
Business    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 31,974 32,163
Multiple residential    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 14,997 14,817
Industrial    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 5,634 5,773
Public authorities    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 6,425 6,985
Other    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 2,160 7,452
Operating and maintenance revenue    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 3,235 3,405
Other non-regulated revenue    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 782 1,150
Non-regulated revenue from contracts with customers    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 4,017 4,555
Lease revenue 606 642
Total non-regulated revenue $ 4,623 $ 5,197