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Share-based compensation (Details 3) (USD $)
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2012
Restricted shares
Sep. 30, 2013
Restricted shares
Sep. 30, 2012
Restricted shares
Jun. 30, 2013
Restricted shares
Sep. 30, 2013
Restricted stock units
Sep. 30, 2012
Restricted stock units
Sep. 30, 2013
Restricted stock units
Sep. 30, 2012
Restricted stock units
Restricted stock awards and restricted stock units                        
Outstanding, beginning of period (in shares)         14,807 9,005 46,807 9,005 300,313 319,071 315,094 247,286
Granted (in shares)                 4,000 0 111,231 94,846
Vested (in shares)         (1,000)   (33,000)   (2,500) (2,500) (116,544) (23,997)
Forfeited (in shares)                 (11,321) (3,346) (19,289) (4,910)
Outstanding, end of period (in shares)         13,807 9,005 13,807 9,005 290,492 313,225 290,492 313,225
Weighted-average grant-date fair value per share                        
Outstanding, beginning of period (in dollars per share)         $ 22.45 [1] $ 22.21 [1] $ 24.45 [1] $ 22.21 [1] $ 25.15 [2] $ 22.81 [2] $ 22.82 [2] $ 21.80 [2]
Granted (in dollars per share)                 $ 26.48 [2] $ 0.00 [2] $ 26.88 [2] $ 26.00 [2]
Vested (in dollars per share)         $ 24.68 [1]   $ 25.35 [1]   $ 22.31 [2] $ 22.31 [2] $ 20.39 [2] $ 24.69 [2]
Forfeited (in dollars per share)                 $ 25.88 [2] $ 24.63 [2] $ 25.62 [2] $ 24.92 [2]
Outstanding, end of period (in dollars per share)         $ 22.29 [1] $ 22.21 [1] $ 22.29 [1] $ 22.21 [1] $ 25.16 [2] $ 22.80 [2] $ 25.16 [2] $ 22.80 [2]
Total weighted-average grant-date fair value $ 100,000 $ 0                 $ 3,000,000 $ 2,500,000
Unrecognized compensation cost           100,000     4,200,000   4,200,000  
Weighted-average period over which unrecognized compensation cost expected to be recognized           1 year 2 months 12 days         2 years 6 months  
Fair value of vested stock (in dollars)             800,000       3,600,000 700,000
Tax benefits realized for the tax deductions $ 900,000 $ 500,000 $ 2,200,000 $ 1,900,000     $ 200,000       $ 1,000,000 $ 200,000
[1] Weighted-average grant-date fair value per share based on the closing or average price of HEI common stock on the date of grant.
[2] Weighted-average grant-date fair value per share based on the average price of HEI common stock on the date of grant.