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Bank Debt (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Bank debt |  |
Maximum borrowing capacity | $ 150,000,000.0 |
Short-term borrowing activities (excluding letters of credit) |  |
Balance outstanding at the end of the period | 0 | $ 59,000,000
Long-term borrowing [Member] |  |
Short-term borrowing activities (excluding letters of credit) |  |
Balance outstanding at the end of the period | $ 95,500,000 |
Short-term borrowing (excluding letters of credit) |  |
Short-term borrowing activities (excluding letters of credit) |  |
Balance outstanding at the end of the period |  | $ 59,000,000
Interest Rate at the end of the period (as a percent) | 3.19% | 2.28%
Average amount outstanding | $ 69,559,000 | $ 65,242,000
Weighted Average Annual Interest Rate (as a percent) | 2.66% | 1.69%
Maximum Amount Outstanding | $ 95,500,000 | $ 102,500,000
Syndicated revolving credit facility |  |
Bank debt |  |
Variable rate basis | Euro rate |
Syndicated revolving credit facility | Minimum |  |
Short-term borrowing activities (excluding letters of credit) |  |
Interest coverage ratio | 325.00% |
Syndicated revolving credit facility | Maximum |  |
Short-term borrowing activities (excluding letters of credit) |  |
Total funded debt ratio | 65.00% |
Syndicated revolving credit facility | Letter of Credit Irrevocable Franchise Agreement with City of Rancho Cordova [Member] |  |
Bank debt |  |
Letter of credit, amount | $ 15,000,000 |
AWR |  |
Bank debt |  |
Maximum borrowing capacity | 150,000,000 |
Short-term borrowing activities (excluding letters of credit) |  |
Balance outstanding at the end of the period | $ 0 | $ 59,000,000
AWR | Syndicated revolving credit facility |  |
Short-term borrowing activities (excluding letters of credit) |  |
Interest coverage ratio | 623.00% |
Total funded debt ratio | 43.00% |
AWR | Syndicated revolving credit facility | Minimum |  |
Short-term borrowing activities (excluding letters of credit) |  |
Interest coverage ratio | 325.00% |
Total funded debt ratio | 65.00% |
AWR | Syndicated revolving credit facility | Maximum |  |
Short-term borrowing activities (excluding letters of credit) |  |
Total funded debt ratio | 100.00% |
AWR | Syndicated revolving credit facility | Letters of credit |  |
Bank debt |  |
Maximum borrowing capacity | $ 25,000,000 |
Letter of credit, amount | $ 900,000 |
Letter of credit fee (as a percent) | 0.65% |
AWR | Syndicated revolving credit facility | Letter of Credit Business Automobile Insurance Policy Security [Member] |  |
Bank debt |  |
Letter of credit, amount | $ 340,000 |
AWR | Syndicated revolving credit facility | Letter of Credit - Purchase of power |  |
Bank debt |  |
Letter of credit, amount | $ 585,000,000 |

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- Definition Represents the interest coverage ratio required to be maintained for debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Current portion of the total carrying amount as of the balance sheet date due within one year or the operating cycle, if longer, on all notes payable to banks paid on an installment with long term maturities. This can include the amount of any loans from the applicant firm. This does not, however, include any mortgage balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)(1),20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Weighted average interest rate of short-term debt outstanding calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period. + References No definition available. + Details
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- Definition For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, the maximum amount borrowed at any time during the period. + References No definition available. + Details
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