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Fair Value of Financial Instruments: (Tables) | 3 Months Ended
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Mar. 31, 2024
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. The fair values as of March 31, 2024 and December 31, 2023 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, 2024 |  | December 31, 2023
(dollars in thousands) |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Financial liabilities: |  |  |  |  |  |  |  |
Long-term debt—AWR (1) |  | $ | 578,932 |  |  | $ | 549,031 |  |  | $ | 579,047 |  |  | $ | 556,214 |
|  | March 31, 2024 |  | December 31, 2023
(dollars in thousands) |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Financial liabilities: |  |  |  |  |  |  |  |
Long-term debt—GSWC (2) |  | $ | 543,932 |  |  | $ | 516,176 |  |  | $ | 544,047 |  |  | $ | 522,883 |
__________________ (1) Excludes debt issuance costs of approximately $3.0 million and $3.1 million as of March 31, 2024 and December 31, 2023, respectively. (2) Excludes debt issuance costs of approximately $2.9 million and $3.0 million as of March 31, 2024 and December 31, 2023, 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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