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Regulatory Matters 4 (Details) - GSWC - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2005 | Jul. 31, 2005 | Dec. 31, 2017
Costs deferred for future recovery on Aerojet case |  |  |
Regulatory matters: |  |  |
Increase in Revenue Requirement, Recoverable through Surcharges |  | $ 21.3 |
Recovery period |  | 20 years |
Reimbursement to recover costs |  |  | $ 17.5
Costs deferred for future recovery on Aerojet case | Maximum |  |  |
Regulatory matters: |  |  |
Recovery period | 20 years |  |
Water Revenue Adjustment Mechanism Net of Modified Cost Balancing Account [Member] |  |  |
Regulatory matters: |  |  |
Amount billed to customers as surcharges |  |  | $ 33.7

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- Definition Repayment received or receivable for expenses incurred on behalf of a client or customer, other than those reimbursements received by landlords from tenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 45 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=68075638&loc=d3e60722-111653 + Details
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