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Equity Incentive Program (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Stock-based compensation expense [Abstract]        
Pre-tax compensation expense $ 2,973 $ 5,464 $ 14,360 $ 18,851
Tax benefit (1,030) (1,917) (5,080) (6,681)
Total stock-based compensation expense, net of tax $ 1,943 $ 3,547 $ 9,280 $ 12,170
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     45.14% 29.81%
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued during period (in shares)     244,707