XML 37 R24.htm IDEA: XBRL DOCUMENT
v3.21.1

Fair Value of Financial Instruments: (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2021
GOLDEN STATE WATER COMPANY |
Fair value of financial instruments |
Schedule of estimates of the fair value of long-term debt | The table below estimates the fair value of long-term debt held by GSWC. The fair values as of March 31, 2021 and December 31, 2020 were determined using rates for similar financial instruments of the same duration utilizing Level 2 methods and assumptions. Changes in the assumptions will produce different results.
|  | March 31, 2021 |  | December 31, 2020
(dollars in thousands) |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Financial liabilities: |  |  |  |  |  |  |  |
Long-term debt—GSWC (1) |  | $ | 444,172 |  |  | $ | 519,888 |  |  | $ | 444,271 |  |  | $ | 559,752 |

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_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
Name: | us-gaap_ScheduleOfCarryingValuesAndEstimatedFairValuesOfDebtInstrumentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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