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Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Taxes and Interest Paid: |  |  |
Income taxes paid | $ 15,984 us-gaap_IncomeTaxesPaidNet | $ 10,880 us-gaap_IncomeTaxesPaidNet | $ 19,411 us-gaap_IncomeTaxesPaidNet
Interest paid | 22,236 us-gaap_InterestPaid | 22,144 us-gaap_InterestPaid | 22,495 us-gaap_InterestPaid
Non-Cash Transactions: |  |  |
Accrued payables for investment in utility plant | 13,147 us-gaap_CapitalExpendituresIncurredButNotYetPaid | 19,515 us-gaap_CapitalExpendituresIncurredButNotYetPaid | 12,113 us-gaap_CapitalExpendituresIncurredButNotYetPaid
Property installed by developers and conveyed | 800 us-gaap_ContributionOfProperty | 2,819 us-gaap_ContributionOfProperty | 2,069 us-gaap_ContributionOfProperty
GSWC |  |  |
Taxes and Interest Paid: |  |  |
Income taxes paid | 16,500 us-gaap_IncomeTaxesPaidNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 7,083 us-gaap_IncomeTaxesPaidNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 11,027 us-gaap_IncomeTaxesPaidNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Interest paid | 22,184 us-gaap_InterestPaid / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 22,144 us-gaap_InterestPaid / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 22,495 us-gaap_InterestPaid / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Non-Cash Transactions: |  |  |
Accrued payables for investment in utility plant | 13,141 us-gaap_CapitalExpendituresIncurredButNotYetPaid / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 19,515 us-gaap_CapitalExpendituresIncurredButNotYetPaid / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 12,113 us-gaap_CapitalExpendituresIncurredButNotYetPaid / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Property installed by developers and conveyed | $ 800 us-gaap_ContributionOfProperty / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | $ 2,819 us-gaap_ContributionOfProperty / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | $ 2,069 us-gaap_ContributionOfProperty / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember

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- Definition Future cash outflow to pay for purchases of fixed assets that have occurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Value of property contributed in noncash investing and financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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