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Taxes on Income (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Taxes on income        
Unrecognized Tax Benefits   $ 0 $ 0 $ 0
Deferred tax assets:        
Regulatory-liability-related   33,419,000 34,567,000  
Contributions and advances   5,281,000 4,679,000  
Deferred Tax Assets, Other   2,988,000 1,934,000  
Deferred tax assets   41,688,000 41,180,000  
Deferred tax liabilities:        
Fixed assets   (131,413,000) (130,115,000)  
Regulatory-asset-related: depreciation and other   (18,146,000) (16,851,000)  
Balancing and memorandum accounts (non-flow-through)   (6,325,000) (9,905,000)  
Deferred tax liabilities   (155,884,000) (156,871,000)  
Accumulated deferred income taxes - net   (114,196,000) (115,691,000)  
Current        
Federal   17,252,000 20,978,000 2,297,000
State   6,538,000 5,844,000 4,798,000
Total current tax expense   23,790,000 26,822,000 7,095,000
Deferred        
Federal   (4,334,000) 11,543,000 26,715,000
State   (1,439,000) 609,000 925,000
Total deferred tax (benefit) expense   (5,773,000) 12,152,000 27,640,000
Reconciliations of the effective tax rates to the federal statutory rate        
Federal taxes on pretax income at statutory rate (21% in 2018; 35% in 2017 and 2016)   17,196,000 37,919,000 33,067,000
Increase (decrease) in taxes resulting from:   3,693,000 4,382,000 3,029,000
Change in tax rate   (14,000) (82,000) 0
Excess deferred tax amortization   (2,101,000) 0 0
Flow-through on fixed assets   429,000 845,000 994,000
Flow-through on pension costs   373,000 412,000 (247,000)
Flow-through on removal costs   (1,445,000) (1,980,000) (2,068,000)
Domestic production activities deduction   (26,000) (1,421,000) (78,000)
Investment tax credit   (69,000) (93,000) (83,000)
Other- net   (19,000) (1,008,000) 121,000
Total income tax expense operations   18,017,000 38,974,000 34,735,000
Pretax income from operations   $ 81,888,000 $ 108,341,000 $ 94,478,000
Effective income tax rate (as a percent)   22.00% 36.00% 36.80%
Proceeds from Income Tax Refunds $ 2,200,000     $ 2,100,000
GSWC        
Deferred tax assets:        
Regulatory-liability-related   $ 33,419,000 $ 34,567,000  
Contributions and advances   5,666,000 5,022,000  
Deferred Tax Assets, Other   3,310,000 1,625,000  
Deferred tax assets   42,395,000 41,214,000  
Deferred tax liabilities:        
Fixed assets   (135,617,000) (134,437,000)  
Regulatory-asset-related: depreciation and other   (18,146,000) (16,851,000)  
Balancing and memorandum accounts (non-flow-through)   (6,873,000) (10,706,000)  
Deferred tax liabilities   (160,636,000) (161,994,000)  
Accumulated deferred income taxes - net   (118,241,000) (120,780,000)  
Current        
Federal   14,488,000 15,044,000 (3,115,000)
State   5,932,000 5,045,000 3,625,000
Total current tax expense   20,420,000 20,089,000 510,000
Deferred        
Federal   (5,531,000) 11,770,000 25,864,000
State   (1,286,000) 2,200,000 2,235,000
Total deferred tax (benefit) expense   (6,817,000) 13,970,000 28,099,000
Reconciliations of the effective tax rates to the federal statutory rate        
Federal taxes on pretax income at statutory rate (21% in 2018; 35% in 2017 and 2016)   12,939,000 30,736,000 26,452,000
Increase (decrease) in taxes resulting from:   3,335,000 4,924,000 3,118,000
Change in tax rate   0 (1,063,000) 0
Excess deferred tax amortization   (2,101,000) 0 0
Flow-through on fixed assets   429,000 845,000 994,000
Flow-through on pension costs   373,000 412,000 (247,000)
Flow-through on removal costs   (1,445,000) (1,980,000) (2,068,000)
Domestic production activities deduction   (25,000) (1,148,000) 0
Investment tax credit   (69,000) (93,000) (82,000)
Other- net   167,000 (700,000) 442,000
Total income tax expense operations   13,603,000 34,059,000 28,609,000
Pretax income from operations   $ 61,615,000 $ 87,816,000 $ 75,578,000
Effective income tax rate (as a percent)   22.10% 38.80% 37.90%