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Equity Incentive Program (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Stock-based compensation expense [Abstract]        
Pre-tax stock-based compensation expense $ 8,435 $ 3,658 $ 16,617 $ 10,403
Tax benefit (498) (817) (1,546) (2,313)
Total stock-based compensation expense, net of tax $ 7,937 2,841 $ 15,071 $ 8,090
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     240.05% 288.57%
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   $ 174   $ 744