Stock-Based Compensation (Schedule of Qualified Stock Option Activity) (Details) (Qualified Stock Options, USD $)	9 Months Ended
	Sep. 30, 2012
Qualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of year	377,480
Granted	61,000
Exercised	(28,650)
Cancelled	(8,100)
Outstanding at September 30, 2012	401,730
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Granted, Exercise Price, in dollars per share	$ 32.76	[1]
Exercised, Exercise Price, in dollars per share	$ 15.31	[1]
Cancelled, Exercise Price, in dollars per share	$ 17.20	[1]
Outstanding at September 30, 2012, Exercise Price, in dollars per share	$ 21.65	[1]
Exercisable at September 30, 2012	263,830
Excercisable at September 30, 2012, Exercise Price, in dollars per share	$ 19.85	[1]
Available for grant at September 30, 2012	109,600

[1] Weighted Averages