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Regulatory Matters: CPUC Rehearing Matter and Procurement Audits (Details) - USD ($) $ in Thousands | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Water Revenue Adjustment Mechanism [Member] | GOLDEN STATE WATER COMPANY |  |  |  |
Regulatory matters: |  |  |  |
Deferred Revenue |  | $ 320 | $ 910 | $ 1,400
Minimum | Other Regulatory Assets Net [Member] |  |  |  |
Regulatory matters: |  |  |  |
Timing of Court Decision | 45 days |  |  |
Minimum | General Rate Case Memorandum Accounts [Member] | GOLDEN STATE WATER COMPANY |  |  |  |
Regulatory matters: |  |  |  |
Regulatory Asset Recovery Periods | 12 months |  |  |
Maximum [Member] | Other Regulatory Assets Net [Member] |  |  |  |
Regulatory matters: |  |  |  |
Timing of Court Decision | 60 days |  |  |
Maximum [Member] | General Rate Case Memorandum Accounts [Member] | GOLDEN STATE WATER COMPANY |  |  |  |
Regulatory matters: |  |  |  |
Regulatory Asset Recovery Periods | 24 months |  |  |

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