Earnings per Share/Capital Stock: (Details 2) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Additional disclosure
Options outstanding (in shares)	0	0
Common Shares issued under DRP and the 2000 and 2008 Employee Plans	19,348	23,914
Payment, Tax Withholding, Share-based Payment Arrangement	$ 1,188	$ 1,269
Weighted Average Dividends Common Stock	13,485	12,361
Dividends paid	$ 13,485	$ 12,361
Dividends Declared Per Common Share (in dollars per share)	$ 0.365	$ 0.335
Net income	$ 14,162	$ 19,268
Total income available to common shareholders, basic	14,129	19,211
Preferred Stock Dividends and Other Adjustments	31	37
Undistributed Earnings, Basic	646	6,870
Undistributed earnings allocated to common shareholders	644	6,850
Undistributed earnings allocated to participating securities	$ 2	$ 20
Weighted average Common Shares outstanding, basic (in shares)	36,944,000	36,898,000
Basic earnings per Common Share (in dollars per share)	$ 0.38	$ 0.52
Restricted Stock Units
Additional disclosure
Restricted stock units outstanding (in shares)	96,586	120,973
AWR
Additional disclosure
Dividends paid	$ 13,500	$ 12,400
GSWC
Additional disclosure
Payment, Tax Withholding, Share-based Payment Arrangement	1,088	1,155
Dividends paid	13,500	12,400
Net income	$ 8,567	$ 12,231