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Stock-Based Incentive Plans (Tables)
9 Months Ended
Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock-based Incentive Plans
Stock-based incentive plan compensation expense is as follows (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2023202220232022
RSUs$5,690 $5,484 $16,103 $16,710 
SARs3,886 3,069 10,713 9,727 
Market performance-based restricted stock units1,071 1,049 392 2,903 
Operating performance-based restricted stock units 866 875 2,271 
Employee share purchase plan266 250 854 881 
Total stock-based compensation expense$11,779 $10,727 $28,069 $32,492 
Stock-based compensation agreements issued during the nine months ended September 30, 2023 representing potential shares and their weighted average grant date fair values by type is as follows (shares in thousands, fair value in dollars):
Nine Months Ended September 30, 2023
SharesWeighted Average Grant Date Fair Value
Service-based SARs974,204 $19.44 
Service-based RSUs502,821 $42.89 
Market performance-based RSUs94,561 $38.95 
Operating performance-based RSUs94,556 $42.30