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Equity Incentive Program (Tables)
9 Months Ended
Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock-based incentive plans compensation expense
Stock-based compensation is reported within selling, general and administrative expenses in the Condensed Consolidated Statements of Earnings. The following table summarizes the Company’s compensation expense relating to all stock-based incentive plans:
 Three Months Ended September 30,Nine Months Ended September 30,
 2021202020212020
Pre-tax stock-based compensation expense$6,660 $7,371 $25,053 $15,591 
Tax benefit(576)(854)(2,357)(1,822)
Total stock-based compensation expense, net of tax$6,084 $6,517 $22,696 $13,769 
Stock Appreciation Rights (SARs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The assumptions used in determining the fair value of the SARs awarded during the respective periods were as follows:
SARs
 20212020
Risk-free interest rate0.59 %1.44 %
Dividend yield1.62 %1.65 %
Expected life (years)5.55.5
Volatility30.49 %22.76 %
Grant price
$122.73$119.86
Fair value per share at date of grant
$29.08$22.54
Performance Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions The assumptions used in determining the fair value of the performance shares granted in the respective periods were as follows:
Performance Shares
20212020
Risk-free interest rate0.19 %1.40 %
Dividend yield1.62 %1.65 %
Expected life (years)2.92.9
Volatility31.90 %23.30 %
Grant price$122.73$119.86
Fair value per share at date of grant$148.29$165.71