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Revenues Contract assets and Contract Liabilities (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Contract with Customer, Asset and Liability [Line Items] |  |  |  |
Contract with Customer, Liability, Revenue Recognized |  |  | $ 3,700 |
Revenue, Remaining Performance Obligation |  |  | 0 |
American States Utility Services [Member] |  |  |  |
Contract with Customer, Asset and Liability [Line Items] |  |  |  |
Government Contract Receivable |  |  | 61,126 | $ 40,150
Contract assets |  |  | 24,447 | 30,388
Contract liabilities |  |  | $ 7,530 | $ 3,911
Minimum | American States Utility Services [Member] |  |  |  |
Contract with Customer, Asset and Liability [Line Items] |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period |  |  | 36 years |
Maximum [Member] | American States Utility Services [Member] |  |  |  |
Contract with Customer, Asset and Liability [Line Items] |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period |  | 50 years |  |
Contracted Services [Member] | American States Utility Services [Member] |  |  |  |
Contract with Customer, Asset and Liability [Line Items] |  |  |  |
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases | 50 years |  | 50 years |

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- Definition Represents the period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases. + References No definition available. + Details
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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130549-203045 + Details
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