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Regulatory Matters (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Regulatory matters:
Regulatory asset not accruing carrying costs	$ 67,500,000
Pension Costs and Other Postretirement Benefit Costs [Member]
Regulatory matters:
Regulatory asset not accruing carrying costs	40,700,000
Derivative unrealized loss
Regulatory matters:
Regulatory asset not accruing carrying costs	3,300,000
Flow-through taxes, net
Regulatory matters:
Regulatory asset not accruing carrying costs	17,600,000
GOLDEN STATE WATER COMPANY
Regulatory matters:
Total	125,704,000	122,681,000
GOLDEN STATE WATER COMPANY \| Various refunds to customers
Regulatory matters:
Total	(759,000)	(4,292,000)
GOLDEN STATE WATER COMPANY \| WRAM, net of MCBA
Regulatory matters:
Total	(9,400,000)	16,345,000
GOLDEN STATE WATER COMPANY \| Base revenue requirement adjustment mechanism
Regulatory matters:
Total	7,761,000	8,725,000
GOLDEN STATE WATER COMPANY \| Costs deferred for future recovery on Aerojet case
Regulatory matters:
Total	13,629,000	14,763,000
GOLDEN STATE WATER COMPANY \| Pension Costs and Other Postretirement Benefit Costs [Member]
Regulatory matters:
Total	43,426,000	20,241,000
GOLDEN STATE WATER COMPANY \| Derivative unrealized loss
Regulatory matters:
Total	3,339,000	0
GOLDEN STATE WATER COMPANY \| Flow-through taxes, net
Regulatory matters:
Total	17,612,000	16,189,000
GOLDEN STATE WATER COMPANY \| Low income rate assistance balancing accounts
Regulatory matters:
Total	9,109,000	9,979,000
GOLDEN STATE WATER COMPANY \| General rate case memorandum accounts
Regulatory matters:
Total	4,731,000	15,645,000
GOLDEN STATE WATER COMPANY \| Other regulatory assets, net
Regulatory matters:
Total	$ 17,487,000	$ 25,086,000