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Equity (Details 5)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number outstanding 685,440
Options outstanding weighted average remaining contractual life 3 years 10 months 6 days
Options exercisable 283,100
$15.59 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number outstanding 70,050
Options outstanding weighted average remaining contractual life 11 months 26 days
Options exercisable 70,050
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 250
Options outstanding weighted average remaining contractual life 29 days
Options exercisable 250
Exercise price range, maximum | $ / shares $ 17.07
$19.33 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number outstanding 87,310
Options outstanding weighted average remaining contractual life 2 years
Options exercisable 66,530
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 2,750
Options outstanding weighted average remaining contractual life 1 year 29 days
Options exercisable 1,750
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 2,800
Options outstanding weighted average remaining contractual life 2 years 29 days
Options exercisable 1,200
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 127,850
Options outstanding weighted average remaining contractual life 5 years
Options exercisable 25,570
Exercise price range, maximum | $ / shares $ 23.61
$25.29 - $28.82 [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 3 years 9 months 14 days
Options exercisable 3,000
Exercise price range, minimum | $ / shares $ 25.29
Exercise price range, maximum | $ / shares $ 28.82
$26.40 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number outstanding 5,000
Options outstanding weighted average remaining contractual life 4 years 29 days
Options exercisable 0
Exercise price range, maximum | $ / shares $ 26.40
$27.80 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number outstanding 114,880
Options outstanding weighted average remaining contractual life 4 years
Options exercisable 45,880
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 2 years 8 months 5 days
Options exercisable 1,000
Exercise price range, maximum | $ / shares $ 29.36
$32.12 - $32.83 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number outstanding 148,350
Options outstanding weighted average remaining contractual life 5 years 10 months 28 days
Options exercisable 1,750
Exercise price range, minimum | $ / shares $ 32.12
Exercise price range, maximum | $ / shares $ 32.83
$35.75 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number outstanding 110,200
Options outstanding weighted average remaining contractual life 3 years
Options exercisable 66,120
Exercise price range, maximum | $ / shares $ 35.75