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Equity Incentive Program (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Stock-based compensation expense [Abstract]    
Pre-tax stock-based compensation expense $ 12,805 $ 11,387
Tax benefit (4,554) (4,050)
Total stock-based compensation expense, net of tax $ 8,251 $ 7,337
Stock Appreciation Rights (SARs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares issued during period (in shares) 1,028,116  
Risk-free interest rate (in hundredths) 1.80% 1.05%
Dividend yield (in hundredths) 2.27% 3.09%
Expected life (in years) 4 years 7 months 4 years 7 months
Volatility (in hundredths) 21.90% 26.17%
Grant price (in dollars per share) $ 79.28 $ 57.25
Fair value at date of grant (in dollars per share) $ 12.63 9.25
Performance Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares issued during period (in shares) 57,958  
Fair value at date of grant (in dollars per share) $ 79.28 $ 57.25
Performance share attainment 169.95% 39.91%
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares issued during period (in shares) 170,310