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Regulatory Matters (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Oct. 31, 2005 | Jul. 31, 2005 | Dec. 31, 2017 | Dec. 31, 2015 | Dec. 31, 2016
Regulatory matters: |  |  |  |  |  |
Litigation Settlement, Amount Awarded to Other Party | $ 2,600 |  |  |  |  |
Regulatory Asset Not Accruing Carrying Costs |  |  |  | $ 59,100 |  |
Pension Costs and Other Postretirement Benefit Costs |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory Asset Not Accruing Carrying Costs |  |  |  | 34,700 |  |
General Rate Case Memorandum Accounts [Member] |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Total |  |  |  | 9,500 |  |
GSWC |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Total |  |  |  | 2,042 |  | $ 146,281
GSWC | Various refunds to customers |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Total |  |  |  | $ (4,552) |  | (5,866)
GSWC | WRAM, net of MCBA |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Recovery Period for under Collection, Balances Greater than 15 Percent of Adopted Annual Revenues |  |  |  | 18 months |  |
Total |  |  |  | $ 29,556 |  | 47,340
GSWC | Costs deferred for future recovery on Aerojet case |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Total |  |  |  | 10,656 |  | 11,820
Regulatory Asset Recovery Periods |  |  | 20 years |  |  |
GSWC | Pension Costs and Other Postretirement Benefit Costs |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Total |  |  |  | 33,019 |  | 28,118
GSWC | Gain (Loss) on Derivative Instruments [Member] |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Total |  |  |  | 2,941 |  | 4,901
GSWC | Flow-through taxes, net |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Total |  |  |  | (17,716) |  | 20,134
GSWC | Deferred Income Tax Charge [Member] |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Total |  |  |  | (83,231) |  | 0
GSWC | Low income rate assistance balancing accounts |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Total |  |  |  | 5,972 |  | 8,272
GSWC | Other regulatory assets, net |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Total |  |  |  | 14,875 |  | 17,633
GSWC | General Rate Case Memorandum Accounts [Member] |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Total |  |  |  | $ 10,522 |  | $ 13,929
Minimum [Member] | GSWC |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Recovery Period for under Collection, Balances Greater than 15 Percent of Adopted Annual Revenues |  |  |  | 19 months |  |
Minimum [Member] | GSWC | WRAM, net of MCBA |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Recovery Period for under Collection, Balances Greater than 15 Percent of Adopted Annual Revenues |  |  |  | 12 months |  |
Minimum [Member] | GSWC | General Rate Case Memorandum Accounts [Member] |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory Asset Recovery Periods |  |  |  | 12 months |  |
Maximum | GSWC | WRAM, net of MCBA |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Recovery Period for under Collection, Balances Greater than 15 Percent of Adopted Annual Revenues |  |  |  | 24 months |  |
Alternative Revenue Program |  |  |  | 24 months | 24 months |
Maximum | GSWC | Costs deferred for future recovery on Aerojet case |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory Asset Recovery Periods |  | 20 years |  |  |  |
Maximum | GSWC | General Rate Case Memorandum Accounts [Member] |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Regulatory Asset Recovery Periods |  |  |  | 36 months |  |

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