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Stock Options (Schedule of Non-Qualified Stock Options Outstanding and Excercisable) (Details) (Non Qualified Options, USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2012
$11.45 - $12.10
Dec. 31, 2012
$13.96 - $19.79
Dec. 31, 2012
$25.02 - $26.45
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]              
Range of Excercise Price, Lower Range Limit         $ 11.45 $ 13.96 $ 25.02
Range of Exercise Price, Upper Range Limit         $ 12.10 $ 19.79 $ 26.45
Options Outstanding, Shares         37,200 0 52,500
Options Outstanding, Shares, Total 89,700 112,800 102,400 186,000      
Options Outstanding, Remaining Contractual Life         7 years [1]   7 years 2 months 27 days [1]
Options Outstanding, Exercise Price         $ 11.45 [1] $ 0.00 [1] $ 25.90 [1]
Options Exercisable, Shares         9,600 0 28,500
Options Exercisable, Shares, Total 38,100 37,400 30,300        
Options Exercisable, Exercise Price         $ 11.45 [1] $ 0.00 [1] $ 25.43 [1]
[1] Weighted Averages