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Regulatory Rate Filings (Details) - USD ($) | Aug. 30, 2019 | Sep. 14, 2018 | Oct. 18, 2019 | Aug. 01, 2019 | Jul. 26, 2019 | Mar. 29, 2019 | Feb. 08, 2019
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Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
CPED Calculated Double-Billing Refund |  | $ 4,935,000 |  |  |  |  |
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. 534 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Memorandum Account, Requested Recovery |  |  |  | $ 1,243,000 |  |  |
Advice Letter No. 530 |  |  |  |  |  |  |
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 |  |  |  |  |
OII No. 18-09-003 Settlement Agreement |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Customer Credit Refund |  |  |  |  | $ 350,000 |  |
Utility Plant Investment Commitment |  |  |  |  | 5,000,000 |  |
OII No. 18-09-003 Settlement Agreement | Minimum |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Customer Credit Refund |  |  |  |  | 1,757,000 |  |
OII No. 18-09-003 Settlement Agreement | Maximum |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Customer Credit Refund |  |  |  |  | $ 2,100,000 |  |
Advice Letter No. 535 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 655,000 |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 0.17% |  |  |  |  |  |
2018 WCMA | Advice Letter No. 532 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Memorandum Account, Requested Recovery |  |  |  |  |  | $ 9,020,000 |
Subsequent Event | Advice Letter No. 537 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Memorandum Account, Requested Refund, Monthly Amount |  |  | $ 1.74 |  |  |  |

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