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Share-Based Payments (Details 1)
 3 Months Ended
Mar. 31, 2017
$ / shares
shares
Shares  
Outstanding at January 1, 2017 684,540
Options granted 5,000
Options forfeited (5,500)
Options exercised (29,790)
Outstanding at March 31, 2017 654,250
Options exercisable 259,635
Options available for future grants 1,080,155
Weighted Average Exercise Price  
Outstanding at January 1, 2017 | $ / shares $ 26.94
Options granted | $ / shares 33.95
Options forfeited | $ / shares 29.89
Options exercised | $ / shares 18.18
Outstanding at March 31, 2017 | $ / shares 27.37
Options exercisable | $ / shares $ 24.91