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Fair Value of Financial Instruments: (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Schedule of estimates of the fair value of long-term debt | The table below estimates the fair value of long-term debt held by AWR and GSWC, respectively. As of September 30, 2025, the outstanding long-term debt of AWR includes $100.0 million from new debt issued by GSWC in May 2025 and $50.0 million from BVES in February 2025. The fair values as of September 30, 2025 and December 31, 2024 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.
|  | September 30, 2025 |  | December 31, 2024
(dollars in thousands) |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Financial liabilities: |  |  |  |  |  |  |  |
Long-term debt—AWR (1) |  | $ | 794,310 |  |  | $ | 789,513 |  |  | $ | 643,893 |  |  | $ | 608,184 |
|  | September 30, 2025 |  | December 31, 2024
(dollars in thousands) |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Financial liabilities: |  |  |  |  |  |  |  |
Long-term debt—GSWC (2) |  | $ | 709,310 |  |  | $ | 702,043 |  |  | $ | 608,893 |  |  | $ | 575,749 |
__________________ (1) Excludes debt issuance costs of approximately $3.6 million and $3.1 million as of September 30, 2025 and December 31, 2024, respectively. (2) Excludes debt issuance costs of approximately $3.2 million and $3.0 million as of September 30, 2025 and December 31, 2024, respectively.

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- 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
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