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Equity Incentive Program (Tables)
 3 Months Ended
Mar. 31, 2019
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 of continuing operations 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 March 31, 
 20192018
Pre-tax stock-based compensation expense (continuing)$8,182 $6,745 
Tax benefit(1,048)(1,496)
Total stock-based compensation expense, net of tax$7,134 $5,249 

Stock-based compensation expense attributable to Apergy employees for the three months ended March 31, 2018 was $569. These costs are reported within earnings from discontinued operations in the Condensed Consolidated Statement of Earnings.
Stock Appreciation Rights (SARs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Valuation assumptions
The range of assumptions used in determining the fair value of the SARs awarded during the respective periods were as follows:
SARs
 20192018
Risk-free interest rate2.51 %2.58 %-2.87 %
Dividend yield2.13 %1.99 %-2.43 %
Expected life (years)5.65.6-5.7
Volatility22.35 %20.95 %-21.20 %
Grant price
$91.20 $79.75 -$82.09 
Fair value per share at date of grant
$17.55 $14.58 -$15.41 
Performance Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Valuation assumptions
The fair value and average attainment used in determining stock-based compensation cost for the performance shares issued in 2019 and 2018 is as follows for the three months ended March 31, 2019:
 20192018
Fair value per share at date of grant
$91.20 $79.75 - $82.09 
Average attainment rate reflected in expense211.68%  267.91%