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Equity Incentive Program (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Stock-based compensation expense [Abstract]    
Pre-tax compensation expense $ 11,387 $ 13,387
Tax benefit (4,050) (4,764)
Total stock-based compensation expense, net of tax $ 7,337 $ 8,623
Stock Appreciation Rights (SARs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares issued during period (in shares) 1,346,354  
Risk-free interest rate (in hundredths) 1.05% 1.51%
Dividend yield (in hundredths) 3.09% 2.24%
Expected life (in years) 4 years 6 months 30 days 5 years 1 month
Volatility (in hundredths) 26.17% 27.19%
Grant price (in dollars per share) $ 57.25 $ 73.28
Fair value at date of grant (in dollars per share) $ 9.25 14.55
Performance Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares issued during period (in shares) 79,561  
Fair value at date of grant (in dollars per share) $ 57.25 $ 73.28
Performance share attainment 87.75% 43.83%
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares issued during period (in shares) 215,181