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Summary of Significant Accounting Policies Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 212,457 $ 172,497 $ 358,985 $ 307,330
Total operating revenue 213,123 175,484 360,860 301,047
Total non-regulated revenue 5,374 4,208 10,946 8,035
Regulated Water and WasteWater Services        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 212,457 172,497 358,985 307,330
Regulatory balancing account revenue 666 2,987 1,875 (6,283)
Total operating revenue 213,123 175,484 360,860 301,047
Residential        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 134,971 116,453 236,342 208,998
Business        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 35,730 28,531 63,452 56,223
Industrial        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 6,019 6,622 12,062 14,500
Public authorities        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 10,358 7,711 16,760 13,608
Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 25,379 13,180 30,369 14,001
Operating and maintenance revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 3,925 2,789 8,013 5,288
Other non-regulated revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 796 834 1,655 1,599
Non-Regulated Services        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 4,721 3,623 9,668 6,887
Lease revenue 653 585 1,278 1,148
Total non-regulated revenue $ 5,374 $ 4,208 $ 10,946 $ 8,035