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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, 2016 | Mar. 31, 2015 | Dec. 31, 2015
WRAM, net of MCBA |  |  |  |
Regulatory matters: |  |  |  |
Increase (decrease) in other regulatory assets |  | $ 10,100 |  |
GOLDEN STATE WATER COMPANY |  |  |  |
Regulatory matters: |  |  |  |
Under (over) collection |  | $ 144,198 |  | $ 132,696
GOLDEN STATE WATER COMPANY | WRAM, net of MCBA |  |  |  |
Regulatory matters: |  |  |  |
Commercial paper, term |  | 90 days |  |
Amount billed to customers as surcharges |  | $ 1,400 | $ 600 |
Under (over) collection |  | 53,948 |  | $ 45,171
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 |  |  | 12 months
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 |  |  |
GOLDEN STATE WATER COMPANY | WRAM |  |  |  |
Regulatory matters: |  |  |  |
Deferred Revenue |  |  |  | $ 1,400
Under (over) collection |  | 55,000 |  |
GOLDEN STATE WATER COMPANY | Modified Cost Balancing Account |  |  |  |
Regulatory matters: |  |  |  |
Under (over) collection |  | $ 1,100 |  |

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- Definition The increase (decrease) during the reporting period in the value of other assets that are created when regulatory agencies permits public utilities to defer costs to the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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