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Earnings per Share/Capital Stock: (Details 2) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	May 19, 2015
Additional disclosure
Options outstanding (in shares)	138,060	174,306	138,060	174,306
Stock options not included in the calculation of diluted EPS (in shares)			0
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			67,832	96,157
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans			$ 210	$ 746
Dividends paid	$ 8,200	$ 8,300	$ 24,558	$ 24,497
Quarterly dividends paid, per share of common stock (in dollars per share)	$ 0.224	$ 0.224	$ 0.672	$ 0.650
Restricted Stock Units
Additional disclosure
Restricted stock units outstanding (in shares)	216,733	211,406	216,733	211,406
2014 and 2015 Stock Repurchase Programs | AWR
Additional disclosure
Authorized shares to be repurchased					2,450,000.00
Common Shares repurchased in the open market under DRP and 401(k) Plan				1,700,000.0

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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