Share-Based Payments (Schedule of Stock Option Activity) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014
Shares
Outstanding, beginning balance	643,595
Options granted	5,500
Options cancelled	(5,210)
Options exercised	(90,720)
Outstanding, ending balance	553,165
Options exercisable	190,830
Options available for future grants	460,785
Weighted Average Exercise Price
Outstanding, beginning balance	$ 19.58
Options granted	$ 31.12
Options cancelled	$ 19.31
Options exercised	$ 12.95
Outstanding, ending balance	$ 20.78
Options exercisable	$ 14.30