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Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers $ 158,933 $ 146,528
Regulatory balancing account revenue 14,060 1,209
Operating revenue 172,993 147,737
Total non-regulated revenue 5,197 5,572
Residential    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 106,560 101,371
Business    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 32,163 27,721
Industrial    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 5,773 6,043
Public authorities    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 6,985 6,403
Other    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 7,452 4,990
Operating and maintenance revenue    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 3,405 4,087
Other non-regulated revenue    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 1,150 860
Non-regulated revenue from contracts with customers    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 4,555 4,947
Lease revenue 642 625
Total non-regulated revenue $ 5,197 $ 5,572