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Regulatory Matters: Alternative-Revenue Programs (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Regulatory matters: |  |
Regulatory assets | $ 19,867 | $ 16,539
Water Revenue Adjustment Mechanism and Modified Cost Balancing Account |  |
Regulatory matters: |  |
Increase (Decrease) in Other Regulatory Assets | 10,700 |
Increase (decrease) in other regulatory assets | 10,700 |
GOLDEN STATE WATER COMPANY |  |
Regulatory matters: |  |
Regulatory assets | $ 23,641 | 12,373
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account |  |
Regulatory matters: |  |
Commercial paper, term | 90 days |
Regulatory assets | $ 19,609 | $ 13,741
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account | Minimum |  |
Regulatory matters: |  |
Regulatory Asset Recovery Periods | 12 months |
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account | Maximum |  |
Regulatory matters: |  |
Regulatory Asset Recovery Periods | 24 months |
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism [Member] |  |
Regulatory matters: |  |
Regulatory assets | $ 3,400 |
GOLDEN STATE WATER COMPANY | Modified Cost Balancing Account |  |
Regulatory matters: |  |
Regulatory assets | $ 16,200 |

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- Definition The increase (decrease) during the reporting period in the value of other assets that are created when regulatory agencies permits public utilities to defer costs to the balance sheet. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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