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Balancing and Memorandum Account Recovery Procedures (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Mar. 26, 2015
Jan. 05, 2015
Memorandum Accounts [Roll Forward]            
Beginning Balance $ (229) $ (1,511) $ (1,377) $ (1,895)    
Revenue Increase(Reduction) 301 (154) 1,122 230    
Refunds (Collections) 150 23 477 23    
Ending Balance 222 (1,642) 222 (1,642)    
Balancing Accounts [Roll Forward]            
Beginning Balance 43,030 10,309 48,437 9,585    
Revenue Increase(Reduction) 1,834 42,227 3,380 42,951    
Refunds (Collections) (4,092) (149) (11,045) (149)    
Ending Balance 40,772 52,387 40,772 52,387    
Balancing and Memorandum Account [Roll Forward]            
Balancing and Memorandum Accounts, Net Assets 42,801 8,798 47,060 7,690    
Revenue Increase(Reduction) 2,135 42,073 4,502 43,181    
Refunds (Collections) (3,942) (126) (10,568) (126)    
Balancing and Memorandum Accounts, Net Assets 40,994 50,745 40,994 50,745    
Balancing Account, Liability 80 0 0 0    
Balancing and Memorandum Account, Revenue Increase (Reduction), Net Liability 0 0 0 0    
Balancing and Memorandum Account, Net Liability, Refunds (Collections) 6,333 0 6,413 0    
Balancing Account, Liability 6,413 0 6,413 0    
Authorized Regulatory Surcharge, Gross     1,937      
Net under-collected balancing and memorandum accounts 22,227   22,227      
Memorandum Account, Recovery Request         $ 9,567 $ 976
Water supply balancing accounts            
Balancing Accounts [Roll Forward]            
Beginning Balance 1,070 (1,221) 890 (2,378)    
Revenue Increase(Reduction) 2,153 2,477 2,445 3,634    
Refunds (Collections) (32) (17) (144) (17)    
Ending Balance 3,191 1,239 3,191 1,239    
Pension balancing account            
Balancing Accounts [Roll Forward]            
Beginning Balance 140 9,672 1,412 9,734    
Revenue Increase(Reduction) (231) (6,625) (692) (6,687)    
Refunds (Collections) (230) (123) (1,041) (123)    
Ending Balance (321) 2,924 (321) 2,924    
2012 General Rate Case true-up            
Balancing Accounts [Roll Forward]            
Beginning Balance 40,367 0 44,400 0    
Revenue Increase(Reduction) 0 46,456 1,937 46,456    
Refunds (Collections) (3,813) 0 (9,783) 0    
Ending Balance 36,554 46,456 36,554 46,456    
Other, net            
Balancing Accounts [Roll Forward]            
Beginning Balance 1,453 1,858 1,735 2,229    
Revenue Increase(Reduction) (88) (81) (310) (452)    
Refunds (Collections) (17) (9) (77) (9)    
Ending Balance 1,348 1,768 1,348 1,768    
Drought Surcharges [Member]            
Balancing Accounts [Roll Forward]            
Beginning Balance 80 0 0 0    
Revenue Increase(Reduction) 0 0 0 0    
Refunds (Collections) (6,333) 0 (6,413) 0    
Ending Balance $ 6,413 $ 0 $ 6,413 $ 0