Stock Options (Schedule of Non-Qualified Stock Options Activity) (Details) (Non Qualified Options, USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Non Qualified Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at beginning of year	89,700		112,800		102,400
Granted	25,000		0		30,000
Exercised	0		(23,100)		(14,600)
Canceled	0		0		(5,000)
Options outstanding at end of year	114,700		89,700		112,800
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding at beginning of year, Exercise Price, in dollars per share	$ 19.91	[1]	$ 18.62	[1]	$ 15.62	[1]
Granted, Exercise Price, in dollars per share	$ 42.70	[1]	$ 0.00	[1]	$ 26.45	[1]
Exercised, Exercise Price, in dollars per share	$ 0.00	[1]	$ 13.62	[1]	$ 11.45	[1]
Cancelled, Exercise Price, in dollars per share	$ 0.00	[1]	$ 0.00	[1]	$ 25.18	[1]
Outstanding at end of year, Exercise Price, in dollars per share	$ 24.87	[1]	$ 19.91	[1]	$ 18.62	[1]
Options exercisable at end of year	57,900		38,100		37,400
Exercisable at end of year, Exercise Price, in dollars per share	$ 19.89	[1]	$ 21.91	[1]	$ 19.57	[1]
Options available for grant at end of year	293,526		322,750		32,500

[1] Weighted Averages