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Stock-Based Incentive Plans Disclosure of Restricted Stock Units (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Granted, weighted average grant date fair value $ 33.53 $ 34.31 $ 19.93  
Pre-tax compensation expense   $ 16,300,000 $ 10,600,000 $ 15,200,000
Accrued employee compensation and benefits 22,435,000 26,191,000    
Minimum
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Multiplier for target award based on total shareholder return on common stock 0.00%      
Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Multiplier for target award based on total shareholder return on common stock 200.00%      
Restricted Stock
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Beginning of period 486,533 666,244 650,323  
Beginning of period, weighted average grant date fair value $ 31.08 $ 28.62 $ 33.09  
Granted 137,852 164,632 209,505  
Granted, weighted average grant date fair value $ 52.23 $ 53.03 $ 30.52  
Released (179,465) (287,735) (159,893)  
Released, weighted average grant date fair value $ 13.83 $ 37.82 $ 48.18  
Forfeited (98,357) (56,608) (33,691)  
Forfeited, weighted average grant date fair value $ 44.40 $ 31.56 $ 34.16  
End of period, weighted average grant date fair value $ 44.74 $ 31.08 $ 28.62  
End of period 346,563 486,533 666,244  
Restricted Stock Units (RSUs)
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Beginning of period 18,000      
Beginning of period, weighted average grant date fair value $ 29.32      
Granted 19,152   20,000  
Granted, weighted average grant date fair value $ 52.23   $ 29.32  
Released (3,910)   (2,000)  
Released, weighted average grant date fair value $ 40.58   $ 29.32  
End of period, weighted average grant date fair value $ 41.19   $ 29.32  
End of period 33,242   18,000  
Cash Settled Restricted Stock Units Classified as Liabilities | Board of Directors
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Beginning of period 41,957 26,000 0  
Beginning of period, weighted average grant date fair value $ 64.26 $ 64.23 $ 0.00  
Granted 0 15,957 29,000  
Granted, weighted average grant date fair value $ 0.00 $ 64.30 $ 61.07  
Released (4,773) 0 (3,000)  
Released, weighted average grant date fair value $ 49.66 $ 0.00 $ 33.67  
End of period, weighted average grant date fair value $ 66.13 $ 64.26 $ 64.23  
End of period 37,184 41,957 26,000  
Pre-tax compensation expense 1,000,000 500,000 1,200,000  
Accrued employee compensation and benefits 2,400,000 1,600,000    
LTIP
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Pre-tax compensation expense 3,800,000 600,000 900,000  
Accrued employee compensation and benefits $ 4,500,000 $ 1,600,000    
Award vesting period 3 years