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Stock-Based Incentive Plans (Tables)
9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Share-based Compensation, Stock Options, Activity
Stock-based incentive plans compensation expense is as follows (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2020201920202019
Service-based restricted stock units (“RSUs”)$4,410 $3,583 $13,139 $10,428 
Service-based stock appreciation rights (“SARs”)3,211 2,896 9,185 7,804 
Market performance-based restricted stock units814 757 2,745 2,146 
Operating performance-based restricted stock units (962)983 882 2,752 
Employee share purchase plan337 312 894 997 
Total stock-based compensation expense$7,810 $8,531 $26,845 $24,127 
Stock-based compensation agreements issued during the nine months ended September 30, 2020, representing potential shares and their weighted average grant date fair values by type follows (shares in thousands, fair value in dollars):
Nine Months Ended September 30, 2020
SharesWeighted Average Grant Date Fair Value
Service-based SARs1,133 $15.73 
Service-based RSUs599 $44.42 
Market performance-based RSUs93 $39.83 
Operating performance-based RSUs93 $43.57