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Equity Incentive Program (Tables)
 6 Months Ended
Jun. 30, 2015
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,
 
2015
 
2014
 
2015
 
2014
Pre-tax compensation expense (1)
$
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



(1)
The increase in share-based compensation expense for the six months ended June 30, 2015 relative to the prior year period is due to the acceleration of expense for awards granted in 2015 to certain employees that have satisfied the terms of retirement eligibility under the 2012 Equity and Cash Incentive Plan. As these individuals are guaranteed the right to vest in these awards, regardless of future service, the related expense was recognized immediately upon grant.
Stock Appreciation Rights (SARs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Valuation assumptions
 
SARs
 
2015
 
2014
Risk-free interest rate
1.51
%
 
1.70
%
Dividend yield
2.24
%
 
1.98
%
Expected life (years)
5.1

 
5.3

Volatility
27.19
%
 
30.81
%
 
 
 
 
Grant price
$
73.28

 
$
82.51

Fair value per share at date of grant
$
14.55

 
$
19.84
Performance Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Valuation assumptions
 
Performance shares
 
2015
 
2014
Fair value per share at date of grant
$
73.28

 
$
82.51

Average attainment rate reflected in expense
24.87
%
 
42.49
%