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Equity Incentive Program (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Stock-based compensation expense [Abstract]        
Pre-tax stock-based compensation expense $ 5,443 $ 3,670 $ 15,846 $ 19,878
Tax benefit (1,207) (1,207) (3,520) (6,953)
Total stock-based compensation expense, net of tax 4,236 2,463 $ 12,326 $ 12,925
Stock Appreciation Rights (SARs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity awards issued during period (in shares)     757,603  
Additional equity awards issued due to modification     1,138,008  
Risk-free interest rate (in hundredths)       1.80%
Dividend yield (in hundredths)       2.27%
Expected life (in years)       4 years 7 months
Volatility (in hundredths)       21.90%
Grant price (in dollars per share)       $ 66.84
Fair value at date of grant (in dollars per share)       10.65
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity awards issued during period (in shares)     284,721  
Additional equity awards issued due to modification     47,063  
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity awards issued during period (in shares)     122,459  
Additional equity awards issued due to modification     26,316  
Fair value at date of grant (in dollars per share)       $ 66.84
Performance share attainment     206.59% 185.07%
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  
Volatility (in hundredths)     20.95%  
Grant price (in dollars per share)     $ 79.75  
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]        
Fair value at date of grant (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  
Volatility (in hundredths)     21.20%  
Grant price (in dollars per share)     $ 82.08  
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)     $ 82.08  
Discontinuing Operations [Member]        
Stock-based compensation expense [Abstract]        
Total stock-based compensation expense, net of tax $ 0 $ 671 $ 744 $ 1,932