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Summary of Significant Accounting Policies: (Details) customer in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) customer registrant | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) | Oct. 31, 2015 USD ($)
Basis of Presentation: |  |  |  |  |  |
Number of registrants filing combined report | registrant |  |  | 2 |  |  |
Related Party Transactions |  |  |  |  |  |
Notes payable to bank | $ 46,000,000 |  | $ 46,000,000 |  | $ 90,000,000 |
Sales and Use Taxes: |  |  |  |  |  |
Non-income tax assessments accounted on a gross basis | 4,475,000 | $ 4,317,000 | 13,386,000 | $ 12,863,000 |  |
AWR | Promissory Note | Notes Receivable |  |  |  |  |  |
Sales and Use Taxes: |  |  |  |  |  |
Notes receivable | 0 | 0 | 0 | 0 |  |
AWR | Syndicated Credit Facility |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |
Maximum borrowing capacity on line of credit | 150,000,000 |  | 150,000,000 |  |  |
GOLDEN STATE WATER COMPANY |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |
Payments to affiliate for corporate office administrative and general costs | 1,000,000 | 1,000,000 | 3,000,000 | 3,000,000 |  |
Sales and Use Taxes: |  |  |  |  |  |
Cost of Reimbursable Expense | 1,000,000 | 1,100,000 | 2,800,000 | 3,000,000 |  |
Non-income tax assessments accounted on a gross basis | $ 4,144,000 | 4,018,000 | $ 12,316,000 | 11,828,000 |  |
GOLDEN STATE WATER COMPANY | Promissory Note |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 40,000,000
Debt instrument, maximum borrowing capacity |  |  |  |  |  | 40,000,000
GOLDEN STATE WATER COMPANY | Water Service Utility Operations |  |  |  |  |  |
Nature of Operations: |  |  |  |  |  |
Number of customers | customer |  |  | 259 |  |  |
GOLDEN STATE WATER COMPANY | Electricity distribution |  |  |  |  |  |
Nature of Operations: |  |  |  |  |  |
Number of customers | customer |  |  | 24 |  |  |
ASUS |  |  |  |  |  |
Nature of Operations: |  |  |  |  |  |
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases | 50 years |  |  |  |  |
Sales and Use Taxes: |  |  |  |  |  |
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases | 50 years |  |  |  |  |
Non-income tax assessments accounted on a gross basis | $ 55,000 | $ 62,000 | $ 177,000 | $ 209,000 |  |
ASUS | Promissory Note |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | 10,000,000
Debt instrument, maximum borrowing capacity |  |  |  |  |  | $ 10,000,000
ASUS | Contracts |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |
Fixed price contract value | $ 601,000,000 |  |  |  |  |
Nature of Operations: |  |  |  |  |  |
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases |  |  | 50 years |  |  |
Sales and Use Taxes: |  |  |  |  |  |
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases |  |  | 50 years |  |  |
Fort Riley |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |
Period of Transition to Operate and Maintain Water Systems at New Military Base | 9 months |  |  |  |  |
Fort Riley | Contracts |  |  |  |  |  |
Nature of Operations: |  |  |  |  |  |
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases |  |  | 50 years |  |  |
Sales and Use Taxes: |  |  |  |  |  |
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases |  |  | 50 years |  |  |
Sales | GOLDEN STATE WATER COMPANY | Water Service Utility Operations |  |  |  |  |  |
Nature of Operations: |  |  |  |  |  |
Percentage of total revenue | 90.00% | 90.00% | 90.00% | 90.00% |  |
Minimum | Fort Riley |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |
Period of Transition to Operate and Maintain Water Systems at New Military Base | 6 months |  |  |  |  |
Maximum | Fort Riley |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |
Period of Transition to Operate and Maintain Water Systems at New Military Base | 12 months |  |  |  |  |

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