CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash Flows From Operating Activities:
Net Income	$ 124,921	$ 78,396	$ 94,347
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	43,254	41,697	39,974
Provision for doubtful accounts	932	1,043	1,119
Deferred income taxes and investment tax credits	4,783	2,803	3,561
Stock-based compensation expense	3,298	2,571	2,566
(Gain) loss on investments held in a trust	(5,008)	5,177	(4,287)
Other — net	289	38	(381)
Changes in assets and liabilities:
Accounts receivable — customers	(6,632)	5,424	(4,688)
Unbilled receivable	(1,283)	9,699	(1,037)
Other accounts receivable	(2,241)	2,115	(1,422)
Unbilled receivable	(6,033)	(5,638)	(4,713)
Materials and supplies	(2,951)	(2,460)	(3,544)
Prepayments and other assets	1,581	3,146	1,323
Contract assets	604	(5,395)	235
Regulatory assets/liabilities	(81,373)	(18,915)	(5,842)
Accounts payable	(10,862)	11,767	(2,881)
Income taxes receivable/payable	2,493	(6,479)	(2,254)
Contract liabilities	449	646	(1,543)
Accrued pension and other post-retirement benefits	1,046	(3,087)	3,051
Other liabilities	416	(4,749)	2,000
Net cash provided (used)	67,683	117,799	115,584
Cash Flows From Investing Activities:
Capital expenditures	(188,540)	(166,240)	(144,515)
Other investing activities	(224)	(862)	(577)
Net cash provided (used)	(188,764)	(167,102)	(145,092)
Cash Flows From Financing Activities:
Receipt of advances for and contributions in aid of construction	11,889	6,901	12,432
Refunds on advances for construction	(4,540)	(5,321)	(4,666)
Repayments of long-term debt	(334)	(377)	(28,356)
Proceeds from the issuance of long-term debt, net of issuance costs	129,665	34,789	0
Net changes in notes payable to banks	54,590	72,000	71,300
Dividends paid	(61,195)	(56,356)	(51,689)
Other	(918)	(1,299)	(1,287)
Net cash provided (used)	129,157	50,337	(2,266)
Net change in cash and cash equivalents	8,076	1,034	(31,774)
Cash and cash equivalents, beginning of year	5,997	4,963	36,737
Cash and cash equivalents, end of year	14,073	5,997	4,963
GSWC
Cash Flows From Operating Activities:
Net Income	102,708	53,770	69,215
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	36,623	35,072	33,643
Provision for doubtful accounts	754	1,018	1,018
Deferred income taxes and investment tax credits	2,949	855	2,308
Stock-based compensation expense	2,994	2,269	2,313
(Gain) loss on investments held in a trust	(5,008)	5,177	(4,287)
Other — net	106	9	(209)
Changes in assets and liabilities:
Accounts receivable — customers	(6,321)	6,263	(4,287)
Unbilled receivable	(2,179)	5,519	(1,195)
Other accounts receivable	(1,484)	931	592
Materials and supplies	(1,260)	(736)	(1,725)
Prepayments and other assets	1,838	2,125	1,860
Regulatory assets/liabilities	(74,378)	(12,704)	(2,854)
Accounts payable	(5,420)	7,671	(10)
Income taxes receivable/payable	1,470	(4,664)	(1,640)
Intercompany receivable/payable	248	(805)	1,479
Accrued pension and other post-retirement benefits	979	(3,228)	2,908
Other liabilities	(278)	(4,034)	1,165
Net cash provided (used)	54,341	94,508	100,294
Cash Flows From Investing Activities:
Capital expenditures	(160,939)	(146,730)	(123,526)
Note receivable from AWR (parent)	0	0	(26,000)
Receipt of payment of note receivable from AWR (parent)	0	0	26,000
Other investing activities	(1,215)	(1,001)	(733)
Net cash provided (used)	(162,154)	(147,731)	(124,259)
Cash Flows From Financing Activities:
Proceeds from issuance of Common Shares to AWR (parent)	10,000	0	0
Receipt of advances for and contributions in aid of construction	11,889	6,901	12,397
Refunds on advances for construction	(4,540)	(5,321)	(4,666)
Repayments of long-term debt	(334)	(377)	(28,356)
Proceeds from the issuance of long-term debt, net of issuance costs	129,665	0	0
Net change in intercompany borrowings	(129,000)	80,000	49,000
Dividends paid	(55,400)	(27,000)	(38,300)
Other	(840)	(1,135)	(1,163)
Net borrowings on notes payable to banks	149,198	0	0
Net cash provided (used)	110,638	53,068	(11,088)
Net change in cash and cash equivalents	2,825	(155)	(35,053)
Cash and cash equivalents, beginning of year	370	525	35,578
Cash and cash equivalents, end of year	$ 3,195	$ 370	$ 525