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Earnings Per Share and Capital Stock 2 (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Capital stock |  |  |
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic |  | $ (145,000) | $ (173,000)
Additional disclosure |  |  |
Common Shares issued under DRP and the 2000 and 2008 Employee Plans | 56,498 | 56,900 | 53,612
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans |  |  | $ 1,198,000
Dividend Reinvestment Plan Common Stock Capital Shares Reserved for Future Issuance | 1,055,948 |  |
Common Shares authorized for issuance but unissued under 401(k) Plan | 387,300 |  |
Common Shares issued as a result of the exercise of stock options | 52,936 | 12,546 | 66,458
Proceeds from Stock Options Exercised, Distributed to Subsidiaries | $ 0 | $ 0 | $ 0
GSWC |  |  |
Additional disclosure |  |  |
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans |  | 501,000 |
Common Stock [Member] |  |  |
Additional disclosure |  |  |
Common Shares issued under DRP and the 2000 and 2008 Employee Plans |  |  | 120,000
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans |  |  | $ 1,198,000
Common Shares repurchased in the open market under DRP and 401(k) Plan |  |  | 1,905,000
Common Stock [Member] | GSWC |  |  |
Additional disclosure |  |  |
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans |  | $ 501,000 |
2014 and 2015 Stock Repurchase Programs [Member] | AWR |  |  |
Additional disclosure |  |  |
Common Shares repurchased in the open market under DRP and 401(k) Plan |  |  | 1,905,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  | 2,450,000.00

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