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Fair Value of Financial Instruments: (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
GOLDEN STATE WATER COMPANY | Reported Value Measurement
Fair value of financial instruments
Long-term Debt, Fair Value	$ 284,778		$ 324,978
GOLDEN STATE WATER COMPANY | Estimate of Fair Value Measurement
Fair value of financial instruments
Long-term Debt, Fair Value	372,745		$ 387,889
Mutual Funds | Fair Value, Inputs, Level 1
Financial liabilities:
Long-term debt-GSWC	$ 18,500
Notes Payable 6.7 Percent Due 2019 [Member] | GOLDEN STATE WATER COMPANY
Fair value of financial instruments
Debt and Capital Lease Obligations		$ 40,000
Financial liabilities:
Debt Instrument, Interest Rate, Stated Percentage		6.70%

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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