Stock-Based Compensation (Schedule of Qualified Stock Option Activity) (Details) (Qualified Stock Options, USD $)	6 Months Ended
	Jun. 30, 2013
Qualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of year	330,730
Granted	49,000
Exercised	(57,180)
Canceled	(5,500)
Outstanding at June 30, 2013	317,050
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Granted, Exercise Price, in dollars per share	$ 42.70	[1]
Exercised, Exercise Price, in dollars per share	$ 16.64	[1]
Cancelled, Exercise Price, in dollars per share	$ 24.24	[1]
Outstanding at June 30, 2013, Exercise Price, in dollars per share	$ 25.93	[1]
Exercisable at June 30, 2013	179,650
Excercisable at June 30, 2013, Exercise Price, in dollars per share	$ 20.95	[1]
Available for grant at June 30, 2013	66,100

[1] Weighted Averages