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Regulatory Matters - Regulatory Assets, Net (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Regulatory assets:    
Total regulatory assets $ 240,020 $ 240,186
Less: current regulatory assets 1,057 4,276
Total regulatory assets, less current portion 238,963 235,910
Regulatory liabilities:    
Total regulatory liabilities 477,223 464,167
Less: current regulatory liabilities 1,930 3,059
Total regulatory liabilities, less current portion $ 475,293 461,108
Minimum    
Regulatory liabilities:    
Estimated service lives of assets 4 years  
Maximum    
Regulatory liabilities:    
Estimated service lives of assets 100 years  
Cost of removal    
Regulatory liabilities:    
Total regulatory liabilities $ 354,148 346,418
Future income tax benefits due to customers    
Regulatory liabilities:    
Total regulatory liabilities 87,104 88,610
Unrecognized pensions and other postretirement benefits    
Regulatory liabilities:    
Total regulatory liabilities 20,408 20,196
Revenue adjustment mechanisms    
Regulatory liabilities:    
Total regulatory liabilities 6,104 5,536
Water supply costs    
Regulatory liabilities:    
Total regulatory liabilities 6,105 0
Other    
Regulatory liabilities:    
Total regulatory liabilities 3,354 3,407
Future income tax benefits due to customers    
Regulatory assets:    
Total regulatory assets 161,351 157,669
Unrecognized pensions and other postretirement benefits    
Regulatory assets:    
Total regulatory assets 24,593 24,593
Business combinations debt premium    
Regulatory assets:    
Total regulatory assets 13,584 14,855
Employee benefit costs    
Regulatory assets:    
Total regulatory assets 6,407 9,815
Monterey Water Revenue Adjustment Mechanism    
Regulatory assets:    
Total regulatory assets 11,450 9,361
Customer Assistance Program ("CAP") balancing account    
Regulatory assets:    
Total regulatory assets 6,179 5,457
Catastrophic event memorandum accounts ("CEMA")    
Regulatory assets:    
Total regulatory assets 962 4,819
2022 general rate case interim memorandum account    
Regulatory assets:    
Total regulatory assets 3,312 4,571
Water supply costs    
Regulatory assets:    
Total regulatory assets 0 583
Other    
Regulatory assets:    
Total regulatory assets $ 12,182 $ 8,463