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Share-Based Payments (Details 1)
 3 Months Ended
Mar. 31, 2016
$ / shares
shares
Shares  
Outstanding, beginning balance 709,300
Options granted 5,000
Options cancelled (7,120)
Options exercised (7,150)
Outstanding, ending balance 700,030
Options exercisable 293,550
Options available for future grants 180,165
Weighted Average Exercise Price  
Outstanding, beginning balance | $ / shares $ 24.34
Options granted | $ / shares 26.40
Options cancelled | $ / shares 26.97
Options exercised | $ / shares 18.41
Outstanding, ending balance | $ / shares 24.39
Options exercisable | $ / shares $ 22.04