XML 83 R67.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Long-Term Debt 3 (Details) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2009 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2013 | Dec. 31, 2017 | Dec. 31, 2014 USD ($) | Oct. 31, 2009 USD ($)
Long-term debt |  |  |  |  |  |
Maximum amount of loan that can be borrowed |  | $ 150,000,000.0 |  |  |  |
Notes Payable 3.45 Percent Due 2029 [Member] |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Interest rate (as a percent) |  | 3.45% |  | 3.45% |  |
GSWC |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Ratio of Indebtedness to EBITDA |  | 3.1 |  |  |  |
GSWC | Maximum |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Ratio of Indebtedness to EBITDA |  | 8 |  |  |  |
GSWC | Private Placement Notes [Member] |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Debt Instrument Covenant Interest Coverage Ratio |  | 400.00% |  |  |  |
GSWC | Private Placement Notes [Member] | Minimum |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Debt Instrument Covenant Interest Coverage Ratio |  | 200.00% |  |  |  |
GSWC | Notes Payable 3.45 Percent Due 2029 [Member] |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 15,000,000 |  |  | $ 15,000,000 |
Interest rate (as a percent) |  | 3.45% |  | 3.45% | 3.45% |
GSWC | American Recovery and Reinvestment Act Obligation due 2033 |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Maximum amount of loan that can be borrowed |  |  |  |  |  | $ 9,000,000.0
Interest rate (as a percent) |  |  | 2.50% |  |  |
Maturity term |  |  | 20 years |  |  |
Loan proceeds received for reimbursement of costs of conversion | $ 8,600,000 |  |  |  |  |

X
- Definition Represents the interest coverage ratio required to be maintained for debt instrument. + References No definition available. + Details
Name: | awr_DebtInstrumentCovenantInterestCoverageRatio
Namespace Prefix: | awr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the term of the debt instrument. + References No definition available. + Details
Name: | awr_DebtInstrumentMaturityTerm
Namespace Prefix: | awr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Ratio of Indebtedness to EBITDA + References No definition available. + Details
Name: | awr_RatioofIndebtednesstoEBITDA
Namespace Prefix: | awr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 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
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=awr_NotesPayable3.45PercentDue2029Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=awr_GoldenStateWaterCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=awr_PrivatePlacementNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=awr_AmericanRecoveryAndReinvestmentActObligationDue2033Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |