Fair Value of Financial Instruments: (Tables)

6 Months Ended

Jun. 30, 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 June 30, 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.

	June 30, 2024				December 31, 2023
(dollars in thousands)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Financial liabilities:
Long-term debt—AWR (1)	$	643,791	$	603,019	$	579,047	$	556,214
	June 30, 2024				December 31, 2023
(dollars in thousands)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Financial liabilities:
Long-term debt—GSWC (2)	$	608,791	$	570,888	$	544,047	$	522,883

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(1) Excludes debt issuance costs of approximately $3.4 million and $3.1 million as of June 30, 2024 and December 31, 2023, respectively.

(2) Excludes debt issuance costs of approximately $3.2 million and $3.0 million as of June 30, 2024 and December 31, 2023, respectively.