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Incentive Plans (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation [Abstract]      
Number of common shares available for grant under the incentive plan (in shares) 1,499,221    
Number of shares of stock authorized for issuance under the Nonqualified Plan (in shares) 3,600,000    
Stock option activity [Roll Forward]      
Outstanding, beginning balance (in shares) 152,000    
Granted (in shares) 0    
Exercised (in shares) (91,000)    
Canceled (in shares) 0    
Outstanding, ending balance (in shares) 61,000 152,000  
Exercisable, ending balance (in shares) 61,000    
Weighted average exercise price [Abstract]      
Outstanding, beginning balance (in dollars per share) $ 19.30    
Granted (in dollars per share) $ 0.00    
Exercised (in dollars per share) $ 15.95    
Canceled (in dollars per share) $ 0.00    
Outstanding, ending balance (in dollars per share) $ 24.24 $ 19.30  
Exercisable, ending balance (in dollars per share) $ 24.24    
Weighted average remaining contractual life, stock option awards outstanding at end of year (in years) 4 years 7 months    
Weighted average remaining contractual life, stock option awards exercisable at end of year (in years) 4 years 7 months    
Aggregate intrinsic value of options outstanding, ending balance $ 731,000    
Aggregate intrinsic value of options exercisable ending balance 731,000    
Intrinsic value of options exercised during the year 1,500,000 2,500,000 2,200,000
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 11,103,000 9,814,000 8,601,000
Tax benefits (expense) associated with stock-based compensation 4,500,000 4,000,000 3,400,000
Fair value of shares vested during the year 12,300,000 11,700,000 11,100,000
Weighted average grant date fair value of restricted stock awards during the year (in dollars per share) $ 29.25 $ 30.47 $ 29.47
Unrecognized compensation expense associated with the unvested shares outstanding $ 12,700,000    
Unrecognized compensation expense, period for recognition (in months) 22 months    
Restricted Stock [Roll Forward]      
Outstanding beginning balance (in shares) 751,000    
Grants (in shares) 407,000    
Vests (in shares) (399,000)    
Canceled (in shares) (19,000)    
Outstanding ending balance (in shares) 740,000 751,000  
Weighted-average market value [Abstract]      
Non-vested, beginning balance (in dollars per share) $ 27.70    
Granted (in dollars per share) $ 29.25 $ 30.47 $ 29.47
Vested (in dollars per share) $ 25.57    
Canceled/forfeited (in dollars per share) $ 29.58    
Non-vested, ending balance (in dollars per share) $ 29.66 $ 27.70  
Employee Stock Purchase Plan (ESPP) [Abstract]      
ESPP Stock Issued During Period (in shares) 34,000 37,000 35,000
Minimum [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock awards vesting period 3 years    
Maximum [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock awards vesting period 5 years