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Equity Incentive Program (Tables)
 6 Months Ended
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock-based incentive plans compensation expense
Stock-based compensation is reported within selling and administrative expenses in the accompanying unaudited Condensed Consolidated Statements of Earnings. The following table summarizes the Company’s compensation expense relating to all stock-based incentive plans:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
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]  
Valuation assumptions
 
SARs
 
2016
 
2015
Risk-free interest rate
1.05
%
 
1.51
%
Dividend yield
3.09
%
 
2.24
%
Expected life (years)
4.6

 
5.1

Volatility
26.17
%
 
27.19
%
 
 
 
 
Grant price
$
57.25

 
$
73.28

Fair value per share at date of grant
$
9.25

 
$
14.55
Performance Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Valuation assumptions
 
Performance shares
 
2016
 
2015
Fair value per share at date of grant
$
57.25

 
$
73.28

Average attainment rate reflected in expense
45.14
%
 
29.81
%