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Earnings per share (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Basic |  |  |  |
Distributed earnings (in dollars per share) | $ 0.31 | $ 0.31 | $ 0.93 | $ 0.93
Undistributed earnings (loss) (in dollars per share) | $ 0.18 | $ 0.19 | $ 0.36 | $ 0.16
Earnings Per Share, basic (in dollars per share) | $ 0.49 | $ 0.50 | $ 1.29 | $ 1.09
Diluted |  |  |  |
Distributed earnings (in dollars per share) | $ 0.31 | $ 0.31 | $ 0.93 | $ 0.93
Undistributed earnings (losses) (in dollars per share) | $ 0.18 | $ 0.19 | $ 0.36 | $ 0.16
Earnings Per Share, diluted (in dollars per share) | $ 0.49 | $ 0.50 | $ 1.29 | $ 1.09
Stock appreciation rights (SARs) | Common stock. |  |  |  |
Antidilutive effect of HEI common stock |  |  |  |
Antidilutive effects of SARs shares that were not included in the computation of diluted EPS (in shares) |  |  |  | 392,000

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