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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
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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

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