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Balancing and Memorandum Accounts (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Public Utilities, General Disclosures [Line Items]    
WCMA Reserve   $ 80
Balancing and Memorandum Revenue Account [Roll Forward]    
Beginning Balance $ (1,940) 25,549
Regulatory Asset Increase (Decrease) 1,757 611
Refunds (Collections) Adjustments 6,841 (2,679)
Ending Balance 6,658 23,481
Balancing and Memorandum Cost Recovery Account [Roll Forward]    
Beginning Balance 7,223 8,864
Regulatory Asset Increase (Decrease) 1,183 (558)
Refunds (Collections) Adjustments (16) (311)
Ending Balance 8,390 7,995
Balancing and Memorandum Account [Roll Forward]    
Beginning Balance 5,283 34,413
Regulatory Asset Increase (Decrease) 2,940 53
Refunds (Collections) 6,825 (2,990)
Ending Balance 15,048 31,476
Total balance, net under-collection amount $ 1,780  
Authorized revenue, threshold percentage 2.00%  
2014-2017 WCMA    
Balancing and Memorandum Revenue Account [Roll Forward]    
Beginning Balance $ 708 7,750
Regulatory Asset Increase (Decrease) 0 0
Refunds (Collections) Adjustments (43) (838)
Ending Balance 665 6,912
2018 WCMA    
Public Utilities, General Disclosures [Line Items]    
Regulatory liability, due to sales in excess of authorized usage   309
Balancing and Memorandum Revenue Account [Roll Forward]    
Beginning Balance 0 9,386
Regulatory Asset Increase (Decrease) 0 (389)
Refunds (Collections) Adjustments 0 0
Ending Balance 0 8,997
2019 WCMA    
Balancing and Memorandum Revenue Account [Roll Forward]    
Beginning Balance 0 0
Regulatory Asset Increase (Decrease) 0 (752)
Refunds (Collections) Adjustments 0 0
Ending Balance 0 (752)
2012 General Rate Case true-up    
Balancing and Memorandum Revenue Account [Roll Forward]    
Beginning Balance 752 11,328
Regulatory Asset Increase (Decrease) 0 95
Refunds (Collections) Adjustments 0 (1,271)
Ending Balance 752 10,152
Cost of capital memorandum account    
Balancing and Memorandum Revenue Account [Roll Forward]    
Beginning Balance (1,553) (1,523)
Regulatory Asset Increase (Decrease) (5) (9)
Refunds (Collections) Adjustments 0 0
Ending Balance (1,558) (1,532)
Tax memorandum account    
Balancing and Memorandum Revenue Account [Roll Forward]    
Beginning Balance (6,643) (6,504)
Regulatory Asset Increase (Decrease) (3) (41)
Refunds (Collections) Adjustments 6,978 0
Ending Balance 332 (6,545)
All others    
Balancing and Memorandum Revenue Account [Roll Forward]    
Beginning Balance 4,796 5,112
Regulatory Asset Increase (Decrease) 1,765 1,707
Refunds (Collections) Adjustments (94) (570)
Ending Balance 6,467 6,249
Balancing and Memorandum Cost Recovery Account [Roll Forward]    
Beginning Balance 446 1,090
Regulatory Asset Increase (Decrease) 1 3
Refunds (Collections) Adjustments (4) (78)
Ending Balance 443 1,015
Water supply costs    
Balancing and Memorandum Cost Recovery Account [Roll Forward]    
Beginning Balance 4,328 9,617
Regulatory Asset Increase (Decrease) 767 (745)
Refunds (Collections) Adjustments (34) (655)
Ending Balance 5,061 8,217
Pension    
Balancing and Memorandum Cost Recovery Account [Roll Forward]    
Beginning Balance 2,449 (1,843)
Regulatory Asset Increase (Decrease) 415 184
Refunds (Collections) Adjustments 22 422
Ending Balance $ 2,886 $ (1,237)