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Allowance for Doubtful Accounts (Tables) | 9 Months Ended
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Sep. 30, 2020
Allowance for Doubtful Accounts [Abstract] |
Schedule of provision for doubtful accounts charged to expense and accounts written off, net of recoveries | The table below presents Registrant’s provision for doubtful accounts charged to expense and accounts written off, net of recoveries.
|  | Three Months Ended September 30, 2020 |  | Nine Months Ended September 30, 2020
(dollars in thousands) |  | AWR |  | GSWC |  | AWR |  | GSWC
Balances at beginning of the period |  | $ | 1,662 |  |  | $ | 1,662 |  |  | $ | 916 |  |  | $ | 916 |
Increase to provision |  | 871 |  |  | 801 |  |  | 1,937 |  |  | 1,867 |
Balance transfer to BVESI (Note 12) |  | — |  |  | (79) |  |  | — |  |  | (79) |
Accounts written off, net of recoveries |  | (80) |  |  | (67) |  |  | (400) |  |  | (387) |
Balances at end of the period |  | $ | 2,453 |  |  | $ | 2,317 |  |  | $ | 2,453 |  |  | $ | 2,317 |
Allowance for doubtful accounts related to accounts receivable-customer |  | $ | 2,400 |  |  | $ | 2,264 |  |  | $ | 2,400 |  |  | $ | 2,264 |
Allowance for doubtful accounts related to other accounts receivable |  | 53 |  |  | 53 |  |  | 53 |  |  | 53 |
Total allowance for doubtful accounts |  | $ | 2,453 |  |  | $ | 2,317 |  |  | $ | 2,453 |  |  | $ | 2,317 |

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- Definition Tabular disclosure of the allowance for doubtful accounts of the entity. + References No definition available. + Details
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Namespace Prefix: | awr_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition Allowance for Doubtful Accounts [Abstract] + References No definition available. + Details
Name: | awr_AllowanceforDoubtfulAccountsAbstract
Namespace Prefix: | awr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration