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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