Annual report pursuant to Section 13 and 15(d)

Stock Compensation Plans (Assumptions Utilized To Estimate The Fair Value For Performance Share Grants) (Details)

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3 Months Ended 12 Months Ended
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2011
Stock Compensation Plans [Abstract]      
Grant Date Market Price $ 93.85 $ 96.70  
Average Expected Term (Years) 2.81 2.81  
Expected Volatility 94.40% 94.40%  
Risk-Free Interest Rate 1.17% 1.17%  
Dividend Yield 0.58% 0.58%  
Fair Value $ 75.64 $ 77.90 $ 88.60
Fair Value (Percent of Grant Date Market Price) 80.60% 80.60%