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Summary of Significant Accounting Policies (Regulatory Rate Filings) (Details)
 1 Months Ended 12 Months Ended
Feb. 17, 2017
USD ($)
Jan. 06, 2017
USD ($)
Nov. 15, 2016
USD ($)
Sep. 15, 2016
USD ($)
Jun. 28, 2016
USD ($)
$ / Ccf
Jun. 10, 2016
USD ($)
Jun. 09, 2016
USD ($)
Feb. 29, 2016
USD ($)
Feb. 05, 2016
USD ($)
$ / Ccf
Dec. 15, 2015
USD ($)
$ / Ccf
Dec. 03, 2015
USD ($)
Jun. 30, 2016
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jan. 05, 2015
USD ($)
Public Utilities General Disclosures [Line Items]                                
Regulatory Balancing and Memorandum Accounts, Net Under-Collected                         $ 3,173,000      
Balancing Account, Revenue Increase (Reduction)                         $ 11,024,000 $ 2,745,000 $ 41,657,000  
Requested rate increase for 2016                               $ 34,928,000
Requested rate increase for 2016 as percentage of total revenue at time of request                               12.22%
Requested rate increase for 2017                               $ 9,954,000
Requested rate increase for 2017 as percentage of total revenue at time of request                               3.11%
Requested rate increase for 2018                               $ 17,567,000
Requested rate increase for 2018 as percentage of total revenue at time of request                               5.36%
Public Utilities, Approved Rate Increase, Percentage, Year 1             8.60%                  
Regulatory Balancing and Memorandum Accounts, Net Under-Collected, Approved             $ 3,776,000                  
Requested Regulatory Surcharge, Interim True-Up         $ 8,767,000                      
Balancing and Memorandum Account Previously Recorded         524,000                      
Requested Regulatory Surcharge, Gross         $ 9,291,000                      
Requested Regulatory Surcharge, Per CCF | $ / Ccf         0.1832       0.1441 0.0492            
Memorandum Account, Authorized Recovery                 $ 7,668,000              
Authorized Regulatory Surcharge, Per 15 CCF               $ 0.46                
Public Utilities, Requested Rate Increase (Decrease), Amount     $ 13,205,000     $ 21,439,000   $ 1,659,000                
Public Utilities, Requested Rate Increase (Decrease), Percentage     3.80%     6.72%   0.55%                
Water Reduction Target Goal, Percentage                       20.00%        
Regulatory Balancing and Memorandum Accounts Review, Authorized Revenue, Threshold Percentage                         2.00%      
Balancing and Memorandum Account, Surcharge Offset                         $ 0 0 0  
Regulatory Assets and Liabilities [Abstract]                                
Net Regulatory Assets                         151,773,000 168,563,000    
Current regulatory assets, net                         16,064,000 16,542,000    
Total regulatory assets, net, less current portion                         135,709,000 152,021,000    
Balancing Account, Recovery Request                   $ 2,599,000            
Balancing Account, Uncollected                   $ 590,000            
2016 General Rate Case True-up [Member]                                
Public Utilities General Disclosures [Line Items]                                
Balancing Account, Revenue Increase (Reduction)                         8,767,000      
Balancing and Memorandum Account Previously Recorded         $ 185,000                      
Deferred Income Tax Charge [Member]                                
Regulatory Assets and Liabilities [Abstract]                                
Regulatory assets                         10,139,000 8,184,000    
Postretirement pensions and other medical benefits [Member]                                
Regulatory Assets and Liabilities [Abstract]                                
Regulatory assets                         109,795,000 109,168,000    
Balancing and Memorandum Accounts [Member]                                
Regulatory Assets and Liabilities [Abstract]                                
Regulatory assets                         25,909,000 45,206,000    
Other Regulatory Assets [Member]                                
Public Utilities General Disclosures [Line Items]                                
Balancing Account, Revenue Increase (Reduction)                         (483,000) (293,000) $ (447,000)  
Regulatory Assets and Liabilities [Abstract]                                
Regulatory assets                         5,930,000 6,005,000    
2014 WCMA [Member]                                
Public Utilities General Disclosures [Line Items]                                
Memorandum Account, Authorized Recovery                     $ 4,259,000          
Authorized Regulatory Surcharge, Per CCF                     $ 0.08          
WCMA Reserve                         1,089,000 1,278,000    
Authorized Regulatory Surcharge, Net                           2,981,000    
2015 WCMA [Member]                                
Public Utilities General Disclosures [Line Items]                                
Memorandum Account, Authorized Recovery                           19,854,000    
WCMA Reserve                         $ 2,112,000 2,343,000    
Balancing and Memorandum Account, Surcharge Offset                           12,139,000    
Authorized Regulatory Surcharge, Net                           $ 5,372,000    
Subsequent Event [Member]                                
Public Utilities General Disclosures [Line Items]                                
Authorized Regulatory Surcharge, Per 15 CCF $ 1.52 $ 3.66                            
Public Utilities, Requested Rate Increase (Decrease), Amount $ 5,339,000                              
Public Utilities, Requested Rate Increase (Decrease), Percentage 1.50% 3.65%                            
Nonregulated Operation [Member]                                
Public Utilities General Disclosures [Line Items]                                
Public Utilities, Approved Rate Increase (Decrease), Percentage       8.60%                        
Authorized Regulatory Surcharge, Per CCF       $ 0.1832