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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2011
Stock-Based Compensation 
Incentive Equity Awards Granted By The Company
Weighted Average Grant Date Fair Value Assumptions
    SSARs Issued on  
    February 24, 2011  
Grant date fair value $ 11.22  
Grant date strike price $ 30.61  
Expected volatility   50.83 %
Expected life   4.25 yrs.
Risk free interest rate   1.85 %
Projected dividend yield   1.96 %