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Fair Value of Financial Instruments: (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
GOLDEN STATE WATER COMPANY | Reported Value Measurement
Fair value of financial instruments
Long-term Debt, Fair Value	$ 325,391	$ 325,582
GOLDEN STATE WATER COMPANY | Estimate of Fair Value Measurement
Fair value of financial instruments
Long-term Debt, Fair Value	425,791	$ 423,124
Mutual Funds | Fair Value, Inputs, Level 1
Financial liabilities:
Long-term debt-GSWC	$ 12,700

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