Annual report pursuant to Section 13 and 15(d)

Summary Of Significant Accounting Policies (Estimated Value Of Non-Vested Shares) (Details)

v2.4.0.6
Summary Of Significant Accounting Policies (Estimated Value Of Non-Vested Shares) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected life (years) 4.50    
Risk free interest rate 1.85%    
Expected volatility 42.22%    
Weighted Average, Fair value $ 10.09 $ 8.34 $ 2.73
Certain Executives [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected life (years) 2.1    
Risk free interest rate 0.28%    
Expected volatility 30.75%    
Weighted Average, Fair value $ 28.66