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Equity Incentive Program (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance share attainment     108.60%  
Stock-based compensation expense [Abstract]        
Pre-tax compensation expense $ 8,297 $ 7,081 $ 24,710 $ 23,384
Tax benefit (2,914) (2,493) (8,749) (8,241)
Total stock-based compensation expense, net of tax $ 5,383 $ 4,588 $ 15,961 $ 15,143
Stock Appreciation Rights (SARs) [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued during period (in shares)     1,043,734  
Risk-free interest rate (in hundredths)     1.70% 1.39%
Dividend yield (in hundredths)     1.98% 2.06%
Expected life (in years)     5 years 4 months 7 years 1 month
Volatility (in hundredths)     30.81% 33.78%
Grant price (in dollars per share)     $ 82.51 $ 63.33
Fair value at date of grant (in dollars per share)     $ 19.84 $ 18.17
Incremental shares issued due to modification     933,845  
Stock Option [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Incremental shares issued due to modification     20,523  
Performance Shares [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued during period (in shares)     58,206  
Risk-free interest rate (in hundredths)       0.40%
Dividend yield (in hundredths)       2.06%
Expected life (in years)       2 years 11 months
Volatility (in hundredths)       30.36%
Fair value at date of grant (in dollars per share)     $ 82.51 $ 70.92
Incremental shares issued due to modification     11,480  
Restricted Stock Units (RSUs) [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued during period (in shares)     131,719  
Incremental shares issued due to modification     5,389