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Equity (Details 5) | 12 Months Ended
--- | ---
Dec. 31, 2015 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Number outstanding | 709,300
Options outstanding weighted average remaining contractual life | 3 years 9 months 25 days
Options exercisable | 294,450
$15.59 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Number outstanding | 92,880
Options outstanding weighted average remaining contractual life | 2 years
Options exercisable | 71,380
Exercise price range, maximum | $ / shares | $ 15.59
$17.07 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Number outstanding | 2,000
Options outstanding weighted average remaining contractual life | 1 year 29 days
Options exercisable | 1,125
Exercise price range, maximum | $ / shares | $ 17.07
$19.03 - $19.33 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Number outstanding | 189,370
Options outstanding weighted average remaining contractual life | 2 years 1 month 20 days
Options exercisable | 142,290
Exercise price range, minimum | $ / shares | $ 19.03
Exercise price range, maximum | $ / shares | $ 19.33
$21.76 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Number outstanding | 3,000
Options outstanding weighted average remaining contractual life | 2 years 1 month 2 days
Options exercisable | 1,000
Exercise price range, maximum | $ / shares | $ 21.76
$22.20 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Number outstanding | 4,000
Options outstanding weighted average remaining contractual life | 3 years 1 month 2 days
Options exercisable | 1,600
Exercise price range, maximum | $ / shares | $ 22.20
$23.61 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Number outstanding | 144,300
Options outstanding weighted average remaining contractual life | 6 years
Options exercisable | 0
Exercise price range, maximum | $ / shares | $ 23.61
$25.82 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Number outstanding | 14,000
Options outstanding weighted average remaining contractual life | 4 years 9 months 18 days
Options exercisable | 0
Exercise price range, maximum | $ / shares | $ 25.82
$27.80 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Number outstanding | 130,100
Options outstanding weighted average remaining contractual life | 5 years
Options exercisable | 26,020
Exercise price range, maximum | $ / shares | $ 27.80
$29.36 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Number outstanding | 2,000
Options outstanding weighted average remaining contractual life | 3 years 8 months 8 days
Options exercisable | 500
Exercise price range, maximum | $ / shares | $ 29.36
$32.12 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Number outstanding | 3,500
Options outstanding weighted average remaining contractual life | 3 years 1 month 2 days
Options exercisable | 875
Exercise price range, maximum | $ / shares | $ 32.12
$35.75 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Number outstanding | 124,150
Options outstanding weighted average remaining contractual life | 4 years
Options exercisable | 49,660
Exercise price range, maximum | $ / shares | $ 35.75

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