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Stock-Based Compensation (Summary Of Options Outstanding And Exercisable) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2012
$21.63 [Member]
Dec. 31, 2012
$21.55 [Member]
Dec. 31, 2012
$21.55 - 21.63 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares, Outstanding, beginning of year 20,000 22,000 22,000 22,000      
Range of Exercise Price, High         $ 21.63 $ 21.55  
Number Outstanding 20,000 22,000 22,000 22,000 10,000 10,000 20,000
Weighted Average Remaining Contractual Life (in years)         0 years 0 years 0 years
Weighted Average Exercise Price, Outstanding, end of year $ 21.59 $ 21.59 $ 21.59 $ 21.59 $ 21.63 $ 21.55 $ 21.59
Options Outstanding, Weighted Average Exercise Price $ 21.59 $ 21.59 $ 21.59 $ 21.59 $ 21.63 $ 21.55 $ 21.59
Shares, Exercisable, end of year 20,000 22,000 22,000   10,000 10,000 20,000
Number Exercisable 20,000 22,000 22,000   10,000 10,000 20,000
Options Exercisable, Weighted Average Exercise Price $ 21.59 $ 21.59 $ 21.59   $ 21.63 $ 21.55 $ 21.59