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Share-Based Compensation (Summary Of Information Relating To Performance-Based Grants) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Performance-Based Awards Disclosure [Line Items]    
Grant year 2011 2010
Shares granted 275,000 227,000
Grant date market price $ 6.54 $ 6.70
Absolute TSR [Member]
    
Performance-Based Awards Disclosure [Line Items]    
Portion of grant 50.00% 50.00%
Annual average return 8.00% 6.00%
Appraisal value $ 4.40 $ 4.56
Relative TSR [Member]
    
Performance-Based Awards Disclosure [Line Items]    
Portion of grant 50.00% 50.00%
Appraisal value $ 5.91 $ 6.00