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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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