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Employee Benefit Plans: (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Components of Net Periodic Benefits Cost:      
Increase (Decrease) in Regulatory Assets and Liabilities $ (5,713) $ (3,493)  
GSWC      
Components of Net Periodic Benefits Cost:      
Increase (Decrease) in Regulatory Assets and Liabilities (5,135) (3,165)  
Pension Plan [Member]      
Components of Net Periodic Benefits Cost:      
Defined Benefit Plan, Service Cost 1,480 1,625  
Defined Benefit Plan, Interest Cost 1,844 1,712  
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 3,292 3,134  
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 109 109  
Defined Benefit Plan, Amortization of Gain (Loss) 0 (993)  
Net periodic benefits costs under accounting standards 141 1,305  
Increase (Decrease) in Regulatory Assets and Liabilities 0 (351)  
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool $ 141 954  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate     2.89%
'Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate, Increase (Decrease) 0.89%    
Defined Benefit Plan, Benefit Obligation $ 259,800    
Expected contributions in current fiscal year $ 3,100    
Pension Plan [Member] | Pro Forma      
Components of Net Periodic Benefits Cost:      
Sensitivity Analysis For Defined Benefit Plan, Benefit Obligation, Impact Of 89 Basis Point Increase In Discount Rate, Percent 12.00%    
Sensitivity Analysis For Defined Benefit Plan, Benefit Obligation, Impact Of 89 Basis Point Increase In Discount Rate, Amount $ 30,400    
Pension Plan [Member] | GSWC      
Components of Net Periodic Benefits Cost:      
Regulatory adjustment — deferred (134)    
Pension Plan [Member] | BVESI      
Components of Net Periodic Benefits Cost:      
Regulatory adjustment — deferred (372)    
Other Postretirement Benefits Plan [Member]      
Components of Net Periodic Benefits Cost:      
Defined Benefit Plan, Service Cost 33 40  
Defined Benefit Plan, Interest Cost 16 31  
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 147 134  
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0 0  
Defined Benefit Plan, Amortization of Gain (Loss) 412 287  
Net periodic benefits costs under accounting standards (510) (350)  
Increase (Decrease) in Regulatory Assets and Liabilities 0 0  
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool (510) (350)  
Supplemental Employee Retirement Plan [Member]      
Components of Net Periodic Benefits Cost:      
Defined Benefit Plan, Service Cost 298 348  
Defined Benefit Plan, Interest Cost 256 229  
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 0 0  
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0 0  
Defined Benefit Plan, Amortization of Gain (Loss) (145) (419)  
Net periodic benefits costs under accounting standards 699 996  
Increase (Decrease) in Regulatory Assets and Liabilities 0 0  
Defined Benefit Plan, Net Periodic Benefit Cost before Allocation to Overhead Pool $ 699 996  
Water Service Utility Operations [Member] | Pension Plan [Member] | GSWC      
Components of Net Periodic Benefits Cost:      
Increase (Decrease) in Regulatory Assets and Liabilities   $ (351)