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Quarterly report pursuant to Section 13 or 15(d)

Stock Compensation Plans (Estimated Fair Value for Performance Share Grants) (Details)

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Stock Compensation Plans (Estimated Fair Value for Performance Share Grants) (Details) (USD $)
0 Months Ended
Mar. 08, 2011
Stock Compensation Plans
Grant Date Market Price $ 96.70
Average Expected Term (Years) 2.81
Expected Volatility 94.40%
Risk-Free Interest Rate 1.17%
Dividend Yield 0.58%
Fair Value $ 77.90
Fair Value (Percent of Grant Date Market Price) 80.60%