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Equity Incentive Program (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Stock-based compensation expense [Abstract]    
Pre-tax stock-based compensation expense $ 8,182 $ 6,745
Tax benefit (1,048) (1,496)
Total stock-based compensation expense, net of tax $ 7,134 $ 5,249
Stock Appreciation Rights (SARs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Equity awards issued during period (in shares) 610,979  
Risk-free interest rate (in hundredths) 2.51%  
Dividend yield (in hundredths) 2.13%  
Expected life (in years) 5 years 7 months 6 days  
Volatility (in hundredths) 22.35%  
Grant price (in dollars per share) $ 91.20  
Fair value at date of grant (in dollars per share) $ 17.55  
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Equity awards issued during period (in shares) 121,560  
Performance Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Equity awards issued during period (in shares) 34,402  
Fair value at date of grant (in dollars per share) $ 91.20  
Performance share attainment 211.68% 267.91%
Minimum [Member] | Stock Appreciation Rights (SARs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate (in hundredths)   2.58%
Dividend yield (in hundredths)   1.99%
Expected life (in years)   5 years 7 months 6 days
Volatility (in hundredths)   20.95%
Fair value at date of grant (in dollars per share)   $ 14.58
Minimum [Member] | Performance Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grant price (in dollars per share)   $ 79.75
Maximum [Member] | Stock Appreciation Rights (SARs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate (in hundredths)   2.87%
Dividend yield (in hundredths)   2.43%
Expected life (in years)   5 years 8 months 12 days
Volatility (in hundredths)   21.20%
Grant price (in dollars per share)   $ 82.09
Fair value at date of grant (in dollars per share)   15.41
Maximum [Member] | Performance Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value at date of grant (in dollars per share)   $ 82.09
Discontinuing Operations [Member]    
Stock-based compensation expense [Abstract]    
Pre-tax stock-based compensation expense   $ 569