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Share-Based Payments (Schedule of Stock Option Activity) (Details)
 9 Months Ended
Sep. 30, 2015
$ / shares
shares
Shares  
Outstanding, beginning balance 639,495
Options granted 14,000
Options cancelled (4,700)
Options exercised (27,915)
Outstanding, ending balance 620,880
Options exercisable 231,310
Options available for future grants 319,235
Weighted Average Exercise Price  
Outstanding, beginning balance | $ / shares $ 23.19
Options granted | $ / shares 25.67
Options cancelled | $ / shares 27.51
Options exercised | $ / shares 16.18
Outstanding, ending balance | $ / shares 23.53
Options exercisable | $ / shares $ 18.76