Stock Options (Schedule of Qualified Stock Options Outstanding and Exercisable) (Details) (Qualified Stock Options, USD $)					12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013 $11.45 - $17.85		Dec. 31, 2013 $19.79 - $32.76		Dec. 31, 2013 $42.70 - $42.70
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Lower Range Limit					$ 11.45		$ 19.79		$ 42.7
Range of Exercise Price, Upper Range Limit					$ 17.85		$ 32.76		$ 42.7
Options Outstanding, Shares					54,550		188,800		49,000
Options Outstanding, Shares, Total	292,350	330,730	377,480	360,130
Options Outstanding, Remaining Contractual Life					5 years 0 months 26 days	[1]	5 years 9 months 7 days	[1]	9 years 4 months 6 days	[1]
Options, Outstanding, Exercise Price					$ 11.80	[1]	$ 26.83	[1]	$ 42.70	[1]
Options Exercisable, Shares					38,350		116,600		0
Options Exercisable, Shares, Total	154,950	192,830	243,180
Options Exercisable, Exercise Price					$ 11.95	[1]	$ 24.73	[1]	$ 0.00	[1]

[1] Weighted Averages