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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 |  |  |

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