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Fair Value of Financial Instruments: (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
GSWC | Reported Value Measurement
Fair value of financial instruments
Long-term Debt, Fair Value	$ 415,685	$ 415,788
GSWC | Estimate of Fair Value Measurement
Fair value of financial instruments
Long-term Debt, Fair Value	450,975	$ 490,852
Mutual Funds | Fair Value, Inputs, Level 1
Financial liabilities:
Long-term debt-GSWC	$ 29,800

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