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Equity Incentive Program (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Stock-based compensation expense [Abstract]        
Pre-tax compensation expense $ 5,464 $ 7,912 $ 18,851 $ 16,413
Tax benefit (1,917) (2,835) (6,681) (5,835)
Total stock-based compensation expense, net of tax $ 3,547 $ 5,077 $ 12,170 $ 10,578
Stock Appreciation Rights (SARs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued during period (in shares)     1,144,529  
Risk-free interest rate (in hundredths)     1.51% 1.70%
Dividend yield (in hundredths)     2.24% 1.98%
Expected life (in years)     5 years 1 month 5 years 4 months
Volatility (in hundredths)     27.19% 30.81%
Grant price (in dollars per share)     $ 73.28 $ 82.51
Fair value at date of grant (in dollars per share)     $ 14.55 $ 19.84
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued during period (in shares)     61,611  
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued during period (in shares)     145,545  
2015 Grant [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance share attainment     24.87%  
2015 Grant [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)     $ 73.28  
2014 Grant [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance share attainment     42.49%  
2014 Grant [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)     $ 82.51