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Share-Based Compensation (Stock Option Pricing Model To Estimate The Fair Value Of Stock Option Awards) (Details)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share-Based Compensation [Abstract]      
Risk-free interest rate 2.20% 3.00% 1.90%
Expected life (in years) 5.2 6.3 6.3
Expected volatility 44.60% 45.10% 43.90%
Dividend 0.00% 0.00% 0.00%