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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, 2011
Y
Dec. 31, 2010
Y
Dec. 31, 2009
Y
Dec. 31, 2008
Y
Stock Options Outstanding [Abstract]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit $ 2.52      
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 3,587 3,707 3,980 3,895
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 5.1 5.2 5.2 5.4
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 16.69 $ 14.14 $ 12.50 $ 11.61
Share Based Compensation Shares Exercisable Under Stock Option Plans Exercise Price Range Lower Range Limit $ 2.53      
Share Based Compensation Shares Exercisable Under Stock Option Plans Exercise Price Range Upper Range Limit $ 28.45      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 2,622 2,785 3,161  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 3.9 4.1 4.2  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 14.51 $ 12.53 $ 10.59  
1993 ISO [Member]
       
Stock Options Outstanding [Abstract]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit $ 2.53      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit $ 0      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 10      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 0.5      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 2.53      
Share Based Compensation Shares Exercisable Under Stock Option Plans Exercise Price Range Lower Range Limit $ 2.53      
Share Based Compensation Shares Exercisable Under Stock Option Plans Exercise Price Range Upper Range Limit $ 0      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 10      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 0.5      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 2.53      
2001 Plan [Member]
       
Stock Options Outstanding [Abstract]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit $ 2.52      
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 3,577      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 5.1      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 16.72      
Share Based Compensation Shares Exercisable Under Stock Option Plans Exercise Price Range Lower Range Limit $ 2.53      
Share Based Compensation Shares Exercisable Under Stock Option Plans Exercise Price Range Upper Range Limit $ 28.45      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 2,612      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 3.9      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 14.56