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Share Based Compensation (Stock Options outstanding and exercisable) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Y
Dec. 31, 2011
Y
Dec. 31, 2010
Y
Dec. 31, 2009
Y
Stock Options Outstanding [Abstract]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 3,713 3,587 3,707 3,980
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 5.0 5.1 5.2 5.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 17.85 $ 16.69 $ 14.14 $ 12.50
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 2,715 2,622 2,785  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 3.7 3.9 4.1  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 16.48 $ 14.51 $ 12.53  
2001 Plan [Member]
       
Stock Options Outstanding [Abstract]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit $ 5.80      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit $ 29.21      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 3,713      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 5.0      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 17.85      
Share Based Compensation Shares Exercisable Under Stock Option Plans Exercise Price Range Lower Range Limit $ 5.80      
Share Based Compensation Shares Exercisable Under Stock Option Plans Exercise Price Range Upper Range Limit $ 29.21      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 2,715      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 3.7      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 16.48