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Stock Options (Schedule of Qualified Stock Options Outstanding and Excercisable) (Details) (Qualified Stock Options, USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2012
$11.45 - $17.85
Dec. 31, 2012
$19.79 - $26.45
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
Range of Exercise Price, Upper Range Limit         $ 17.85 $ 26.45
Options Outstanding, Shares         104,480 226,250
Options Outstanding, Shares, Total 330,730 377,480 360,130 345,480    
Options Outstanding, Remaining Contractual Life         4 years 10 months 6 days [1] 6 years 11 months 19 days [1]
Options, Outstanding, Exercise Price         $ 12.39 [1] $ 26.17 [1]
Options Exercisable, Shares         69,480 123,350
Options Exercisable, Shares, Total 192,830 243,180 209,530      
Options Exercisable, Exercise Price         $ 12.87 [1] $ 23.21 [1]
[1] Weighted Averages