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Equity Incentive Program (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Stock-based compensation expense [Abstract]        
Pre-tax stock-based compensation expense $ 4,341 $ 3,431 $ 21,810 $ 17,791
Tax benefit (1,436) (1,192) (7,623) (6,272)
Total stock-based compensation expense, net of tax $ 2,905 $ 2,239 $ 14,187 $ 11,519
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     139.95% 11.99%
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued during period (in shares)     174,203