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Regulatory Matters 2 (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2012 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Regulatory matters: |  |  |  |
Regulated Operating Revenue, Water |  | $ 302,931 | $ 328,511 | $ 326,672
General Rate Case Memorandum Accounts [Member] |  |  |  |
Regulatory matters: |  |  |  |
Under (over) collection |  | $ 9,500 |  |
General Rate Case Memorandum Accounts [Member] | Minimum [Member] |  |  |  |
Regulatory matters: |  |  |  |
Recovery period |  | 12 months |  |
General Rate Case Memorandum Accounts [Member] | Maximum [Member] |  |  |  |
Regulatory matters: |  |  |  |
Recovery period |  | 24 months |  |
WRAM |  |  |  |
Regulatory matters: |  |  |  |
Over collection |  | $ 19,700 |  |
Deferred Revenue |  | 510 |  |
GSWC |  |  |  |
Regulatory matters: |  |  |  |
Under (over) collection |  | 146,281 | 132,696 |
Regulated Operating Revenue, Water |  | 302,931 | 328,511 | $ 326,672
GSWC | General Rate Case Memorandum Accounts [Member] |  |  |  |
Regulatory matters: |  |  |  |
Under (over) collection |  | $ 13,929 | 4,433 |
GSWC | General Rate Case Memorandum Accounts [Member] | Minimum [Member] |  |  |  |
Regulatory matters: |  |  |  |
Recovery period |  | 12 months |  |
GSWC | General Rate Case Memorandum Accounts [Member] | Maximum [Member] |  |  |  |
Regulatory matters: |  |  |  |
Recovery period |  | 24 months |  |
GSWC | WRAM, net of MCBA |  |  |  |
Regulatory matters: |  |  |  |
Commercial paper, term |  | 90 days |  |
Amount billed to customers as surcharges |  | $ 18,400 |  |
Under (over) collection |  | $ 47,340 | 45,171 |
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 |  |
Annual surcharges as a percentage of the last authorized revenue requirement |  | 10.00% |  |
GSWC | WRAM, net of MCBA | Minimum [Member] |  |  |  |
Regulatory matters: |  |  |  |
Recovery period for under-collection balances greater than 15% of adopted annual revenues | 19 months | 12 months |  |
GSWC | WRAM, net of MCBA | Maximum [Member] |  |  |  |
Regulatory matters: |  |  |  |
Alternative revenue program |  | 24 months |  |
Recovery period for under-collection balances that are up to 15% of adopted annual revenues | 36 months |  |  |
Recovery period for under-collection balances greater than 15% of adopted annual revenues |  | 24 months |  |
GSWC | Other Regulatory Assets (Liabilities) [Member] |  |  |  |
Regulatory matters: |  |  |  |
Under (over) collection |  | $ 800 |  |
GSWC | WRAM |  |  |  |
Regulatory matters: |  |  |  |
Under (over) collection |  | 34,700 |  |
Regulated Operating Revenue, Water |  | 910 |  |
Deferred Revenue |  |  | $ 1,400 |
GSWC | Modified Cost Balancing Account |  |  |  |
Regulatory matters: |  |  |  |
Under (over) collection |  | $ 12,600 |  |

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