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Leases Lease -additional information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease right-of-use assets	$ 11,058		$ 11,058		$ 7,600	$ 0
Operating lease liabilities	1,808		1,808			0
Operating lease liabilities	9,548		9,548			0
Short-term Lease Payments			2,200
Debt Instrument [Line Items]
Operating Lease, Expense	630	$ 567	1,300	$ 1,100
Notes Payable 9.56 Percent Due 2031 [Member]
Debt Instrument [Line Items]
Notes Payable to Bank	$ 28,000		$ 28,000
Debt Instrument, Interest Rate, Stated Percentage	9.56%		9.56%
Golden State Water Company [Member]
Leases [Abstract]
Operating lease right-of-use assets	$ 10,432		$ 10,432			0
Operating lease liabilities	1,484		1,484			0
Operating lease liabilities	$ 9,283		$ 9,283			$ 0
Debt Instrument [Line Items]
Ratio of Indebtedness to Net Capital	0.46		0.46
Golden State Water Company [Member] | Maximum [Member]
Debt Instrument [Line Items]
Ratio of Indebtedness to Net Capital	0.6667		0.6667

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Contractual interest rate for funds borrowed, under the debt agreement.

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Including the current and noncurrent portions, the carrying value as of the balance sheet date of notes payable to banks, excluding mortgage notes, initially due beyond one year or beyond the operating cycle if longer.

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Amount of operating lease expense. Excludes sublease income.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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