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Regulatory Rate Filings (Details) - USD ($)
3 Months Ended
Apr. 01, 2019
Mar. 19, 2019
Jan. 01, 2019
Sep. 14, 2018
Mar. 31, 2019
Mar. 29, 2019
Feb. 08, 2019
Jan. 04, 2018
Jun. 06, 2017
Public Utilities, General Disclosures [Line Items]                  
Regulatory Rate Filings, Requested Rate Increase, Year One               $ 34,288,000  
Regulatory Rate Filings, Requested Rate Increase as Percentage of Total Revenue at Time of Request, Year One               9.76%  
Regulatory Rate Filings, Requested Rate Increase, Year Two               $ 14,232,000  
Regulatory Rate Filings, Proposed Rate Increase, Percent of Authorized Revenue, Year Two               3.70%  
Regulatory Rate Filings, Requested Rate Increase, Year Three               $ 20,582,000  
Regulatory Rate Filings, Requested Rate Increase, Percent of Authorized Revenue, Year Three               5.17%  
Memorandum Account, Requested Recovery               $ 20,725,000  
CPED Calculated Double-Billing Refund       $ 4,935,000          
Public Utilities, Approved Reimbursement Fee, Percentage 1.23%       1.40%        
Minimum                  
Public Utilities, General Disclosures [Line Items]                  
CPED Proposed Penalty, Per Offense, Per Day       500          
Maximum                  
Public Utilities, General Disclosures [Line Items]                  
CPED Proposed Penalty, Per Offense, Per Day       50,000          
Advice Letter No. 528/528A [Member]                  
Public Utilities, General Disclosures [Line Items]                  
Public Utilities, Approved Rate Decrease, Amount     $ 16,378,000            
Public Utilities, Approved Rate Increase (Decrease), Percentage     4.55%            
Approved Balancing and Memorandum Accounts, Net     $ 27,045,000            
Advice Letter No. 510 [Member]                  
Public Utilities, General Disclosures [Line Items]                  
Requested Service Charge Refund                 $ 1,794,000
Advice Letter No. 530 [Member]                  
Public Utilities, General Disclosures [Line Items]                  
Approved Service Charge Refund             $ 2,020,000    
CPED Calculated Refund 2014-2016                  
Public Utilities, General Disclosures [Line Items]                  
CPED Calculated Service Charge Refund       2,061,000          
CPED Calculated Refund 1987-2013                  
Public Utilities, General Disclosures [Line Items]                  
CPED Calculated Service Charge Refund       $ 1,990,000          
CPED Calculated Refund 1987-2011 [Member]                  
Public Utilities, General Disclosures [Line Items]                  
CPED Calculated Service Charge Refund   $ 1,847,000              
2018 WCMA [Member] | Advice Letter No. 532 [Member]                  
Public Utilities, General Disclosures [Line Items]                  
Memorandum Account, Requested Recovery           $ 9,020,000