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Regulatory Matters 2 (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Oct. 31, 2005 | Jul. 31, 2005 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Regulatory matters: |  |  |  |  |  |
Regulatory Asset Not Accruing Carrying Costs |  |  |  | $ 59,100 |  |
Litigation Settlement, Amount Awarded to Other Party | $ 2,600 |  |  |  |  |
Regulated Operating Revenue, Water |  |  |  | 306,332 | $ 302,931 | $ 328,511
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: |  |  |  |  |  |
Under (over) collection |  |  |  | 9,500 |  |
WRAM |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Over collection |  |  |  | 15,400 |  |
GSWC |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Under (over) collection |  |  |  | 2,042 | 146,281 |
Regulated Operating Revenue, Water |  |  |  | $ 306,332 | 302,931 | $ 328,511
GSWC | Minimum [Member] |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Recovery period for under-collection balances greater than 15% of adopted annual revenues |  |  |  | 19 months |  |
GSWC | Maximum |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Recovery period for under-collection balances that are up to 15% of adopted annual revenues |  |  |  | 36 months |  |
GSWC | Pension Costs and Other Postretirement Benefit Costs |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Under (over) collection |  |  |  | $ 33,019 | 28,118 |
GSWC | Costs deferred for future recovery on Aerojet case |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Under (over) collection |  |  |  | 10,656 | 11,820 |
Recovery period |  |  | 20 years |  |  |
Increase in Revenue Requirement, Recoverable through Surcharges |  |  | $ 21,300 |  |  |
GSWC | Costs deferred for future recovery on Aerojet case | Maximum |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Recovery period |  | 20 years |  |  |  |
GSWC | Gain (Loss) on Derivative Instruments [Member] |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Under (over) collection |  |  |  | 2,941 | 4,901 |
GSWC | Flow-through taxes, net |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Under (over) collection |  |  |  | (17,716) | 20,134 |
GSWC | General Rate Case Memorandum Accounts [Member] |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Under (over) collection |  |  |  | $ 10,522 | 13,929 |
GSWC | General Rate Case Memorandum Accounts [Member] | Minimum [Member] |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Recovery period |  |  |  | 12 months |  |
GSWC | General Rate Case Memorandum Accounts [Member] | Maximum |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Recovery period |  |  |  | 36 months |  |
GSWC | WRAM, net of MCBA |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Commercial paper, term |  |  |  | 90 days |  |
Amount billed to customers as surcharges |  |  |  | $ 33,700 |  |
Under (over) collection |  |  |  | $ 29,556 | 47,340 |
Under-collection balances as a percentage of adopted annual revenues |  |  |  | 15.00% |  |
Recovery period for under-collection balances greater than 15% of adopted annual revenues |  |  |  | 18 months |  |
GSWC | WRAM, net of MCBA | Minimum [Member] |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Recovery period for under-collection balances greater than 15% of adopted annual revenues |  |  |  | 12 months |  |
GSWC | WRAM, net of MCBA | Maximum |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Alternative Revenue Program |  |  |  | 24 months |  | 24 months
Recovery period for under-collection balances greater than 15% of adopted annual revenues |  |  |  | 24 months |  |
GSWC | WRAM |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Under (over) collection |  |  |  | $ 5,600 |  |
Regulated Operating Revenue, Water |  |  |  | 510 | 910 |
Deferred Revenue |  |  |  |  |  | $ 1,400
GSWC | Modified Cost Balancing Account |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Under (over) collection |  |  |  | 24,000 |  |
Various refunds to customers | GSWC |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |
Under (over) collection |  |  |  | $ (4,552) | $ (5,866) |

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