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Balancing and Memorandum Account Recovery Procedures (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Memorandum Accounts [Roll Forward]        
Beginning Balance $ 8,554 $ 7,971 $ 4,357 $ 8,910
Revenue Increase(Reduction) 4,142 6,787 17,173 14,364
Refunds (Collections) (2,665) (2,751) (3,999) (4,506)
Surcharge Offset 6 (5,863) (7,494) (12,624)
Ending Balance 10,037 6,144 10,037 6,144
Balancing Accounts [Roll Forward]        
Beginning Balance 20,462 38,013 21,552 36,296
Revenue Increase(Reduction) 2,408 2,594 3,963 11,639
Refunds (Collections) (6,420) (16,647) (16,635) (30,736)
Surcharge Offset 0 5,863 7,570 12,624
Ending Balance 16,450 29,823 16,450 29,823
Balancing and Memorandum Account [Roll Forward]        
Beginning Balance 29,016 45,984 25,909 45,206
Revenue Increase (Reduction) 6,550 9,381 21,136 26,003
Refunds (Collections) (9,085) (19,398) (20,634) (35,242)
Surcharge Offset 6 0 76 0
Ending Balance 26,487 35,967 26,487 35,967
2014 WCMA        
Memorandum Accounts [Roll Forward]        
Beginning Balance [1] 908 1,563 0 2,944
Revenue Increase(Reduction) [1] 0 164 1,089 11
Refunds (Collections) [1] (866) (1,044) (1,047) (2,272)
Surcharge Offset [1] 0 0 0 0
Ending Balance [1] 42 683 42 683
Balancing and Memorandum Account [Roll Forward]        
WCMA Reserve   1,267   1,267
2015 WCMA        
Memorandum Accounts [Roll Forward]        
Beginning Balance [1] 2,095 4,747 1,589 5,372
Revenue Increase(Reduction) [1] (11) 528 2,101 431
Refunds (Collections) [1] (1,799) (1,883) (3,405) (2,411)
Surcharge Offset [1] 0 0 0 0
Ending Balance [1] 285 3,392 285 3,392
Balancing and Memorandum Account [Roll Forward]        
WCMA Reserve   1,892   1,892
2016 WCMA        
Memorandum Accounts [Roll Forward]        
Beginning Balance 0 0 0 0
Revenue Increase(Reduction) 55 5,863 1,507 12,624
Refunds (Collections) 0 0 0 0
Surcharge Offset 0 (5,863) (1,452) (12,624)
Ending Balance 55 0 55 0
2017 WCMA        
Memorandum Accounts [Roll Forward]        
Beginning Balance [1] 1,001 0 0 0
Revenue Increase(Reduction) [1] 3,954 0 11,003 0
Refunds (Collections) [1] 0 0 0 0
Surcharge Offset [1] 6 0 (6,042) 0
Ending Balance [1] 4,961 0 4,961 0
2017 WCMA - Post Drought Surcharges        
Memorandum Accounts [Roll Forward]        
Revenue Increase(Reduction) 4,826   6,103  
2017 WCMA Reserve Recorded [Member]        
Memorandum Accounts [Roll Forward]        
Revenue Increase(Reduction) 866   1,142  
Water supply costs        
Balancing Accounts [Roll Forward]        
Beginning Balance 7,314 2,641 5,190 2,771
Revenue Increase(Reduction) 2,278 2,420 3,833 2,364
Refunds (Collections) 0 452 569 378
Surcharge Offset 0 0 0 0
Ending Balance 9,592 5,513 9,592 5,513
Drought surcharges        
Balancing Accounts [Roll Forward]        
Beginning Balance (961) (1,716) (7,688) (359)
Revenue Increase(Reduction) 0 0 0 0
Refunds (Collections) 0 (10,467) (767) (18,585)
Surcharge Offset 0 5,863 7,494 12,624
Ending Balance (961) (6,320) (961) (6,320)
Pension        
Balancing Accounts [Roll Forward]        
Beginning Balance (2,907) (520) (2,009) (552)
Revenue Increase(Reduction) 224 280 670 840
Refunds (Collections) 0 (1,055) (1,344) (1,583)
Surcharge Offset 0 0 0 0
Ending Balance (2,683) (1,295) (2,683) (1,295)
2012 General Rate Case true-up        
Balancing Accounts [Roll Forward]        
Beginning Balance 15,765 27,740 20,682 33,070
Revenue Increase(Reduction) 0 0 0 0
Refunds (Collections) (4,123) (3,850) (9,040) (9,180)
Surcharge Offset 0 0 0 0
Ending Balance 11,642 23,890 11,642 23,890
2015 General Rate Case true-up        
Balancing Accounts [Roll Forward]        
Beginning Balance     5,528 0
Revenue Increase(Reduction)     0 8,767
Refunds (Collections)     (5,414) (1,204)
Surcharge Offset     0 0
Ending Balance 114 7,563 114 7,563
2016 General Rate Case True-up [Member]        
Balancing Accounts [Roll Forward]        
Beginning Balance 2,411 8,767    
Revenue Increase(Reduction) 0 0    
Refunds (Collections) (2,297) (1,204)    
Surcharge Offset 0 0    
Ending Balance 114 7,563 114 7,563
All others        
Memorandum Accounts [Roll Forward]        
Beginning Balance 4,550 1,661 2,768 594
Revenue Increase(Reduction) 144 232 1,473 1,298
Refunds (Collections) 0 176 453 177
Surcharge Offset 0 0 0 0
Ending Balance 4,694 2,069 4,694 2,069
Balancing Accounts [Roll Forward]        
Beginning Balance (1,160) 1,101 (151) 1,366
Revenue Increase(Reduction) (94) (106) (540) (332)
Refunds (Collections) 0 (523) (639) (562)
Surcharge Offset 0 0 76 0
Ending Balance $ (1,254) $ 472 $ (1,254) $ 472
[1] As of September 30, 2017, the reserve balance for the 2017 WCMA was $1,142 which has been netted from the balance above. As of September 30, 2016, the reserve balance for the 2014 WCMA and 2015 WCMA was $1,267 and $1,892, respectively, which has been netted from the balances above.