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Long-Term Incentive Compensation (Tables)
9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Stock Option Activity
The following table presents a summary of activity for stock options, service-based restricted stock awards and performance-based stock unit awards for the nine months ended September 30, 2021 (in thousands):
Stock OptionsService-based Restricted StockPerformance-based Stock Units
Outstanding – December 31, 2020530 1,087 287 
Granted— 598 245 
Vested— (633)(70)
Forfeited(142)(59)(42)
Outstanding – September 30, 2021388 993 420 
Weighted average grant date fair value (2021 awards)$— $6.78 $6.84