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Regulatory Matters: Alternative-Revenue Programs (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account |  |  |
Regulatory matters: |  |  |
Increase (decrease) in other regulatory assets | $ 3,700 |  |
GOLDEN STATE WATER COMPANY |  |  |
Regulatory matters: |  |  |
Under (over) collection | $ (4,728) |  | $ 2,042
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account |  |  |
Regulatory matters: |  |  |
Commercial paper, term | 90 days |  |
Amount billed to customers as surcharges | $ 4,200 | $ 4,000 |
Under (over) collection | $ 29,011 |  | $ 29,556
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account | Minimum |  |  |
Regulatory matters: |  |  |
Recovery Period for under Collection, Balances Greater than 15 Percent of Adopted Annual Revenues |  |  | 12 months
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account | Maximum |  |  |
Regulatory matters: |  |  |
Regulatory asset recovery periods | 24 months |  |
Recovery Period for under Collection, Balances Greater than 15 Percent of Adopted Annual Revenues |  |  | 24 months
GOLDEN STATE WATER COMPANY | WRAM |  |  |
Regulatory matters: |  |  |
Under (over) collection | $ 3,300 |  |
GOLDEN STATE WATER COMPANY | Modified Cost Balancing Account |  |  |
Regulatory matters: |  |  |
Under (over) collection | $ 25,700 |  |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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