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Retirement and Share-based Compensation Plans Stock Options, Changes in the Number of Options Outstanding (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 5,732,450 4,844,850 4,120,850 3,142,189
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 1,558,900 1,486,850 1,794,200  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 7.60 $ 12.99 $ 8.76  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Total Exercise Price $ 11,854 $ 19,309 $ 15,726  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (28,050) (177,500) (120,000)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price $ 8.74 $ 9.66 $ 8.64  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Total Exercise Price (245) (1,714) (1,037)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (643,250) (585,350) (695,539)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price $ 8.77 $ 8.00 $ 8.80  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercised in Period, Total Exercise Pirice (5,642) (4,685) (6,122)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 9.61 $ 10.13 $ 8.78 $ 8.79
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Total Exercise Price $ 55,064 $ 49,097 $ 36,187 $ 27,620
Share Based Compensation Arrangement by Payment Award, Options, Vested [Member] | Exercise Price Range II [Member]
       
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 7.70      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 1,500,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 3 years 7 months 3 days      
Share Based Compensation Arrangement by Payment Award, Options, Vested [Member] | Exercise Price Range III [Member]
       
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 10.47      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 2,218,350      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 5 years 4 months 2 days      
Share Based Compensation Arrangement by Payment Award, Options, Vested [Member] | Exercise Price Range IV [Member]
       
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 13.03      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 1,413,100      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 5 years 1 month 13 days      
Share Based Compensation Arrangement by Payment Award, Options, Vested [Member] | Exercise Price Range V, All Options [Member]
       
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 10.36      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 5,131,450      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 4 years 9 months 7 days      
Share Based Compensation Arrangement by Payment Award, Options, Outstanding [Member] | Exercise Price Range II [Member]
       
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 7.70      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 1,500,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 3 years 7 months 3 days      
Share Based Compensation Arrangement by Payment Award, Options, Outstanding [Member] | Exercise Price Range III [Member]
       
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 10.35      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 2,714,350      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 5 years 6 months 21 days      
Share Based Compensation Arrangement by Payment Award, Options, Outstanding [Member] | Exercise Price Range IV [Member]
       
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 12.97      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 1,518,100      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 5 years 4 months 13 days      
Share Based Compensation Arrangement by Payment Award, Options, Outstanding [Member] | Exercise Price Range V, All Options [Member]
       
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 10.35      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 5,732,450      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 5 years