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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT 2 (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed financial statements                      
Income before income tax expense                 $ 108,341 $ 94,478 $ 98,215
Net Income $ 12,868 $ 21,006 $ 22,792 $ 12,701 $ 11,212 $ 21,639 $ 16,742 $ 10,150 $ 69,367 $ 59,743 $ 60,484
Weighted Average Number of Shares Outstanding (in shares)                 36,638 36,552 37,389
Basic Earnings Per Common Share (in dollars per share)                 $ (1.88) $ (1.63) $ (1.61)
Weighted Average Number of Diluted Common Shares Outstanding                 36,844 36,750 37,614
Fully Diluted Earnings per Common Share (in dollars per share)                 $ 1.88 $ 1.62 $ 1.60
Dividends Declared Per Common Share (in dollars per share)                 $ 0.994 $ 0.914 $ 0.874
AWR                      
Condensed financial statements                      
Operating revenues and other income                 $ 0 $ 71 $ 98
Operating Expenses and Other Expenses                 344 19 11
Operating income / (loss)                 (344) 52 87
Equity in earnings of subsidiaries                 67,490 59,145 59,587
Income before income tax expense                 67,146 59,197 59,674
Income tax expense (benefit)                 (2,221) (546) (810)
Net Income                 $ 69,367 $ 59,743 $ 60,484