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Regulatory Assets and Liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Regulatory Assets and Liabilities      
Total Regulatory Assets $ 373,619 $ 373,619 $ 353,569
Total Regulatory Liabilities 202,760 202,760 211,275
Short-term portion of the regulatory assets 33,466 33,466 42,394
Short-term portion of the regulatory liabilities 17,855 17,855 12,213
Property-related temporary differences (tax benefits flowed through to customers)      
Regulatory Assets and Liabilities      
Total Regulatory Liabilities 180,141 180,141 180,205
Health care balancing account      
Regulatory Assets and Liabilities      
Total Regulatory Liabilities 3,817 3,817 3,516
Conservation program      
Regulatory Assets and Liabilities      
Total Regulatory Liabilities 6,599 6,599 6,880
Net WRAM and MCBA long-term payable      
Regulatory Assets and Liabilities      
Total Regulatory Liabilities 120 120 222
Tax accounting memorandum account      
Regulatory Assets and Liabilities      
Total Regulatory Liabilities 765 765 5,039
Cost of capital memorandum account      
Regulatory Assets and Liabilities      
Total Regulatory Liabilities 147 147 2,834
1,2,3 trichloropropane settlement proceeds      
Regulatory Assets and Liabilities      
Total Regulatory Liabilities 10,950 10,950 12,142
Other regulatory liabilities      
Regulatory Assets and Liabilities      
Total Regulatory Liabilities 221 221 437
Pension and retiree group health      
Regulatory Assets and Liabilities      
Total Regulatory Assets 156,618 156,618 156,947
Property-related temporary differences (tax benefits flowed through to customers)      
Regulatory Assets and Liabilities      
Total Regulatory Assets 100,626 100,626 99,376
Other accrued benefits      
Regulatory Assets and Liabilities      
Total Regulatory Assets 21,342 21,342 20,588
Net WRAM and MCBA long-term accounts receivable      
Regulatory Assets and Liabilities      
Total Regulatory Assets 30,460 30,460 17,134
Asset retirement obligations, net      
Regulatory Assets and Liabilities      
Total Regulatory Assets $ 19,140 19,140 18,197
Interim rates long-term accounts receivable      
Regulatory Assets and Liabilities      
Recovery Period 1 year    
Total Regulatory Assets $ 4,642 4,642 4,642
Tank coating      
Regulatory Assets and Liabilities      
Recovery Period 10 years    
Total Regulatory Assets $ 12,559 12,559 11,196
Health care balancing account      
Regulatory Assets and Liabilities      
Recovery Period 1 year    
Total Regulatory Assets $ 442 442 442
Pension balancing account      
Regulatory Assets and Liabilities      
Recovery Period 1 year    
Total Regulatory Assets $ 18,211 18,211 16,494
Other components of net periodic benefit cost      
Regulatory Assets and Liabilities      
Total Regulatory Assets 3,983 3,983 3,221
Other regulatory assets      
Regulatory Assets and Liabilities      
Total Regulatory Assets $ 5,596 $ 5,596 $ 5,332
Minimum | Net WRAM and MCBA long-term accounts receivable      
Regulatory Assets and Liabilities      
Recovery Period   1 year  
Maximum | Net WRAM and MCBA long-term accounts receivable      
Regulatory Assets and Liabilities      
Recovery Period   2 years