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Regulatory Matters: Alternative-Revenue Programs (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2012 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015
WRAM, net of MCBA |  |  |  |  |
Regulatory matters: |  |  |  |  |
Increase (decrease) in other regulatory assets |  | $ 11,600 |  |  |
WRAM, net of MCBA | Maximum |  |  |  |  |
Regulatory matters: |  |  |  |  |
WRAM and MCBA Recovery Period |  | 24 months |  |  |
GOLDEN STATE WATER COMPANY |  |  |  |  |
Regulatory matters: |  |  |  |  |
Net Regulatory Assets |  | $ 155,987 |  | $ 146,281 |
GOLDEN STATE WATER COMPANY | WRAM, net of MCBA |  |  |  |  |
Regulatory matters: |  |  |  |  |
Commercial paper, term |  | 90 days |  |  |
Amount billed to customers as surcharges |  | $ 4,000 | $ 1,400 |  |
Net Regulatory Assets |  | $ 55,298 |  | $ 47,340 |
Under Collection Balances as Percentage of Adopted Annual Revenues | 15.00% |  |  |  |
annual surcharges as percentage of last authorized revenue requirement | 10.00% |  |  |  |
GOLDEN STATE WATER COMPANY | WRAM, net of MCBA | Minimum |  |  |  |  |
Regulatory matters: |  |  |  |  |
Recovery Period for under Collection, Balances Greater than 15 Percent of Adopted Annual Revenues | 19 months |  |  |  |
WRAM and MCBA Recovery Period |  | P12M |  |  |
GOLDEN STATE WATER COMPANY | WRAM, net of MCBA | Maximum |  |  |  |  |
Regulatory matters: |  |  |  |  |
Alternative Revenue Program |  |  |  | 24 months |
Recovery Period for under Collection, Balances Greater than 15 Percent of Adopted Annual Revenues |  |  |  | 18 months |
Recovery Period for under Collection Balances that are up to 15 Percent of Adopted Annual Revenues | 36 months |  |  |  |
WRAM and MCBA Recovery Period |  | P18M |  |  |
Regulatory Asset Recovery Periods |  |  |  |  | 24 months
GOLDEN STATE WATER COMPANY | General Rate Case Memorandum Accounts [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Net Regulatory Assets |  | $ 14,689 |  | $ 13,929 |
GOLDEN STATE WATER COMPANY | WRAM |  |  |  |  |
Regulatory matters: |  |  |  |  |
Deferred Revenue |  | 320 |  | $ 910 | $ 1,400
Net Regulatory Assets |  | 40,000 |  |  |
GOLDEN STATE WATER COMPANY | Modified Cost Balancing Account |  |  |  |  |
Regulatory matters: |  |  |  |  |
Net Regulatory Assets |  | $ 15,300 |  |  |

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