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Equity Incentive Program (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Stock-based compensation expense [Abstract]        
Pre-tax stock-based compensation expense $ 7,876 $ 5,443 $ 24,493 $ 15,846
Tax benefit (489) (1,207) (2,035) (3,520)
Total stock-based compensation expense, net of tax $ 7,387 4,236 $ 22,458 $ 12,326
Stock Appreciation Rights (SARs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity awards issued during period (in shares)     615,089  
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)     124,929  
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity awards issued during period (in shares)     35,172  
Fair value at date of grant (in dollars per share)     $ 91.20  
Performance share attainment     223.04% 293.36%
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   $ 0   $ 744