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Regulatory Matters: (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Jul. 01, 2019 USD ($)	Jun. 30, 2019 USD ($)	May 30, 2019 USD ($)
Regulatory matters:
Regulatory asset not accruing carrying costs	$ (53,400)		$ (53,400)
Number of parties	2		2
Water Revenue Adjustment Mechanism and Modified Cost Balancing Account
Regulatory matters:
Increase (Decrease) in Other Regulatory Assets			$ 20,500
Pension and other post-retirement obligations
Regulatory matters:
Regulatory asset not accruing carrying costs	$ (35,000)		(35,000)
GOLDEN STATE WATER COMPANY
Regulatory matters:
Regulatory assets	5,264		5,264		$ 28,340
GOLDEN STATE WATER COMPANY | Tax Cuts and Jobs Act memorandum accounts
Regulatory matters:
Regulatory assets	0		0		8,293
GOLDEN STATE WATER COMPANY | Various refunds to customers
Regulatory matters:
Regulatory assets	7,921		7,921		7,517
GOLDEN STATE WATER COMPANY | Authorized Capital Infrastructure [Member]
Regulatory matters:
Regulatory assets								$ (334,500)
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account
Regulatory matters:
Amount billed to customers as surcharges	5,500	$ 7,700	9,100	$ 17,500
Regulatory assets	(29,228)		(29,228)		(17,763)
GOLDEN STATE WATER COMPANY | Costs deferred for future recovery on Aerojet case
Regulatory matters:
Regulatory assets	(8,663)		(8,663)		(9,516)
GOLDEN STATE WATER COMPANY | Pension and other post-retirement obligations
Regulatory matters:
Regulatory assets	(32,222)		(32,222)		(33,124)
GOLDEN STATE WATER COMPANY | Derivative [Member]
Regulatory matters:
Regulatory asset not accruing carrying costs	(3,000)		(3,000)
GOLDEN STATE WATER COMPANY | Derivative unrealized loss
Regulatory matters:
Regulatory assets	(3,022)		(3,022)		(311)
GOLDEN STATE WATER COMPANY | Low income rate assistance balancing accounts
Regulatory matters:
Regulatory assets	(538)		(538)		(2,784)
GOLDEN STATE WATER COMPANY | General Rate Case Memorandum Accounts
Regulatory matters:
Regulatory assets	(6,014)		(6,014)		(5,054)
GOLDEN STATE WATER COMPANY | Deferred Income Tax Charge
Regulatory matters:
Regulatory asset not accruing carrying costs	(80,300)		(80,300)
Regulatory assets	80,303		80,303		81,465
GOLDEN STATE WATER COMPANY | Flow-through taxes, net
Regulatory matters:
Regulatory asset not accruing carrying costs	(14,000)		(14,000)
Regulatory assets	14,037		14,037		15,273
GOLDEN STATE WATER COMPANY | Other Regulatory Assets Net [Member]
Regulatory matters:
Regulatory assets	(17,310)		(17,310)		(15,656)
GOLDEN STATE WATER COMPANY | Deferred Project Costs [Member]
Regulatory matters:
Regulatory assets								$ (20,400)
GOLDEN STATE WATER COMPANY | Other Regulatory Assets (Liabilities) [Member]
Regulatory matters:
Regulatory assets							$ (1,100)
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism [Member]
Regulatory matters:
Regulatory assets	$ (19,100)		$ (19,100)
Water general rate case [Member] | General Rate Case Memorandum Accounts
Regulatory matters:
Regulatory assets							$ (5,600)
Water Service Utility Operations [Member] | Tax Cuts and Jobs Act memorandum accounts
Regulatory matters:
Regulatory assets						$ 7,200
Electric general rate case [Member] [Member] | Revenues retroactive due to GRC delay [Member]
Regulatory matters:
Increase (Decrease) in Other Regulatory Assets					$ 2,300
Maximum [Member] | GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account
Regulatory matters:
Regulatory Asset Recovery Periods			24 months
Maximum [Member] | GOLDEN STATE WATER COMPANY | General Rate Case Memorandum Accounts
Regulatory matters:
Regulatory Asset Recovery Periods			24 months
Minimum [Member] | GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account
Regulatory matters:
Regulatory Asset Recovery Periods			12 months
Minimum [Member] | GOLDEN STATE WATER COMPANY | General Rate Case Memorandum Accounts
Regulatory matters:
Regulatory Asset Recovery Periods			12 months

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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The net amount of all regulatory assets less all regulatory liabilities as of the end of the period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 1
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