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Earnings per Share/Capital Stock: (Details 2) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Additional disclosure
Options outstanding (in shares)	29,160	47,792
Anti-dilutive stock options not included in the computation of diluted EPS (in shares)	0	0
Common Shares issued under DRP and the 2000 and 2008 Employee Plans	37,376	52,622
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans	$ 75	$ 340
Payments Related to Tax Withholding for Share-based Compensation	(1,569)	(1,210)
Weighted Average Dividends Common Stock	10,113	9,362
Dividends paid	$ 10,113	$ 9,362
Dividends Declared Per Common Share (in dollars per share)	$ 0.275	$ 0.255
Restricted Stock Units
Additional disclosure
Restricted stock units outstanding (in shares)	184,833	193,740
Golden State Water Company [Member]
Additional disclosure
Payments Related to Tax Withholding for Share-based Compensation	$ (1,308)	$ (1,049)
Dividends paid	$ 10,100	$ 9,380

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