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Summary of Significant Accounting Policies (Balancing and Memorandum Accounts) (Details) - USD ($)
 12 Months Ended
Dec. 28, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Balancing and Memorandum Accounts [Line Items]        
Revenue Accounts, Beginning Balance   $ 21,705,000    
Balancing and Memorandum Revenue Account, Increase (Decrease)   3,827,000    
Balancing and Memorandum Revenue Account, Refunds (Collections)   17,000    
Balancing and Memorandum Revenue Account, Surcharge Offset   0 $ 0 $ 0
Revenue Accounts, Ending Balance   25,549,000 21,705,000  
Cost-recovery Accounts, Beginning Balance   6,220,000    
Balancing and Memorandum Cost Recovery Account, Increase (Decrease)   2,643,000    
Balancing and Memorandum Cost Recovery Account, Refunds (Collections)   1,000    
Balancing and Memorandum Cost Recovery Account, Surcharge Offset   0    
Cost-recovery Accounts, Ending Balance   8,864,000 6,220,000  
Balancing and Memorandum Account, Beginning Balance   27,925,000 25,909,000 45,206,000
Balancing and Memorandum Account, Increase (Decrease)   6,470,000 22,187,000 29,887,000
Balancing and Memorandum Account, Refunds (Collections), Net   18,000 (21,206,000) (49,184,000)
Balancing and Memorandum Account, Surcharge Offset   0 1,035,000 0
Balancing and Memorandum Account, Ending Balance   34,413,000 27,925,000 25,909,000
Regulatory Balancing and Memorandum Accounts, Net Under-Collected   $ 1,573,000    
Approved Balancing and Memorandum Accounts, Net $ 27,045,000      
Authorized Regulatory Surcharge, Net $ 0.5894      
Regulatory Balancing and Memorandum Accounts Review, Authorized Revenue, Threshold Percentage   2.00%    
Cost-Recovery Accounts [Member]        
Schedule of Balancing and Memorandum Accounts [Line Items]        
Revenue Accounts, Beginning Balance   $ 6,220,000 3,181,000 2,219,000
Balancing and Memorandum Revenue Account, Increase (Decrease)     3,815,000 2,740,000
Balancing and Memorandum Revenue Account, Refunds (Collections)     (776,000) (1,778,000)
Revenue Accounts, Ending Balance     6,220,000 3,181,000
2017 WCMA Reserve Recorded [Member]        
Schedule of Balancing and Memorandum Accounts [Line Items]        
Memorandum Account, Revenue Increase (Reduction)   0 (1,169,000)  
2014-2016 WCMA [Member]        
Schedule of Balancing and Memorandum Accounts [Line Items]        
Revenue Accounts, Beginning Balance   191,000 1,589,000 8,316,000
Balancing and Memorandum Revenue Account, Increase (Decrease)   (116,000) 4,758,000 17,107,000
Balancing and Memorandum Revenue Account, Refunds (Collections)   4,000 (4,704,000) (7,126,000)
Balancing and Memorandum Revenue Account, Surcharge Offset   0 (1,452,000) (16,708,000)
Revenue Accounts, Ending Balance   79,000 191,000 1,589,000
Water supply balancing accounts [Member]        
Schedule of Balancing and Memorandum Accounts [Line Items]        
Cost-recovery Accounts, Beginning Balance   8,679,000    
Balancing and Memorandum Cost Recovery Account, Increase (Decrease)   939,000    
Balancing and Memorandum Cost Recovery Account, Refunds (Collections)   (1,000)    
Balancing and Memorandum Cost Recovery Account, Surcharge Offset   0    
Cost-recovery Accounts, Ending Balance   9,617,000 8,679,000  
Drought Surcharges [Member]        
Schedule of Balancing and Memorandum Accounts [Line Items]        
Revenue Accounts, Beginning Balance   0 (7,688,000) (359,000)
Balancing and Memorandum Revenue Account, Increase (Decrease)     0 0
Balancing and Memorandum Revenue Account, Refunds (Collections)     (765,000) (24,037,000)
Balancing and Memorandum Revenue Account, Surcharge Offset     8,453,000 16,708,000
Revenue Accounts, Ending Balance     0 (7,688,000)
Pension Balancing Account [Member]        
Schedule of Balancing and Memorandum Accounts [Line Items]        
Cost-recovery Accounts, Beginning Balance   (2,459,000)    
Balancing and Memorandum Cost Recovery Account, Increase (Decrease)   614,000    
Balancing and Memorandum Cost Recovery Account, Refunds (Collections)   2,000    
Balancing and Memorandum Cost Recovery Account, Surcharge Offset   0    
Cost-recovery Accounts, Ending Balance   (1,843,000) (2,459,000)  
2012 General Rate Case True-up [Member]        
Schedule of Balancing and Memorandum Accounts [Line Items]        
Revenue Accounts, Beginning Balance   11,319,000 20,682,000 33,070,000
Balancing and Memorandum Revenue Account, Increase (Decrease)   0 0 0
Balancing and Memorandum Revenue Account, Refunds (Collections)   9,000 (9,363,000) (12,388,000)
Balancing and Memorandum Revenue Account, Surcharge Offset   0 0 0
Revenue Accounts, Ending Balance   11,328,000 11,319,000 20,682,000
2015 General Rate Case True-up [Member]        
Schedule of Balancing and Memorandum Accounts [Line Items]        
Revenue Accounts, Beginning Balance   115,000 5,528,000 0
Balancing and Memorandum Revenue Account, Increase (Decrease)   0 0 8,767,000
Balancing and Memorandum Revenue Account, Refunds (Collections)   3,000 (5,413,000) (3,239,000)
Balancing and Memorandum Revenue Account, Surcharge Offset   0 0 0
Revenue Accounts, Ending Balance   118,000 115,000 5,528,000
Cost of capital [Member]        
Schedule of Balancing and Memorandum Accounts [Line Items]        
Revenue Accounts, Beginning Balance   (144,000) (817,000) (1,440,000)
Balancing and Memorandum Revenue Account, Increase (Decrease)   (1,379,000) 0 3,000
Balancing and Memorandum Revenue Account, Refunds (Collections)   0 673,000 620,000
Balancing and Memorandum Revenue Account, Surcharge Offset   0 0 0
Revenue Accounts, Ending Balance   (1,523,000) (144,000) (817,000)
Other Regulatory Assets [Member]        
Schedule of Balancing and Memorandum Accounts [Line Items]        
Revenue Accounts, Beginning Balance   3,735,000 3,434,000 3,400,000
Balancing and Memorandum Revenue Account, Increase (Decrease)   1,258,000 1,084,000 1,270,000
Balancing and Memorandum Revenue Account, Refunds (Collections)   1,000 (858,000) (1,236,000)
Balancing and Memorandum Revenue Account, Surcharge Offset   0 75,000 0
Revenue Accounts, Ending Balance   4,994,000 3,735,000 3,434,000
Cost-recovery Accounts, Beginning Balance   0    
Balancing and Memorandum Cost Recovery Account, Increase (Decrease)   1,090,000    
Balancing and Memorandum Cost Recovery Account, Refunds (Collections)   0    
Balancing and Memorandum Cost Recovery Account, Surcharge Offset   0    
Cost-recovery Accounts, Ending Balance   1,090,000 0  
2017 WCMA [Member]        
Schedule of Balancing and Memorandum Accounts [Line Items]        
Memorandum Account, Revenue Increase (Reduction), Gross   1,182,000    
Revenue Accounts, Beginning Balance   6,489,000 0  
Balancing and Memorandum Revenue Account, Increase (Decrease)   1,182,000 12,530,000  
Balancing and Memorandum Revenue Account, Refunds (Collections)   0 0  
Balancing and Memorandum Revenue Account, Surcharge Offset   0 (6,041,000)  
Revenue Accounts, Ending Balance   7,671,000 6,489,000 $ 0
2018 WCMA [Member]        
Schedule of Balancing and Memorandum Accounts [Line Items]        
Memorandum Account, Revenue Increase (Reduction)   (9,386,000)    
Revenue Accounts, Beginning Balance   0    
Balancing and Memorandum Revenue Account, Increase (Decrease)   9,386,000    
Balancing and Memorandum Revenue Account, Refunds (Collections)   0    
Balancing and Memorandum Revenue Account, Surcharge Offset   0    
Revenue Accounts, Ending Balance   9,386,000 0  
2018 WCMA Reserve Recorded [Member]        
Schedule of Balancing and Memorandum Accounts [Line Items]        
Memorandum Account, Revenue Increase (Reduction)   0    
Tax memorandum [Member]        
Schedule of Balancing and Memorandum Accounts [Line Items]        
Revenue Accounts, Beginning Balance   0    
Balancing and Memorandum Revenue Account, Increase (Decrease)   (6,504,000)    
Balancing and Memorandum Revenue Account, Refunds (Collections)   0    
Balancing and Memorandum Revenue Account, Surcharge Offset   0    
Revenue Accounts, Ending Balance   $ (6,504,000) $ 0