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Reconciliation of Basic and Diluted Shares
 9 Months Ended
Sep. 30, 2022
Earnings Per Share [Abstract]  
Reconciliation of Basic and Diluted Shares Reconciliation of Basic and Diluted Shares
Three Months EndedNine Months Ended
September 30September 30
(In thousands, except per share amounts)2022202120222021
Income (loss) from continuing operations attributable to Harsco Corporation common stockholders$625 $5,040 $(113,408)$12,015 
Weighted-average shares outstanding:
  Weighted-average shares outstanding - basic79,531 79,287 79,469 79,214 
  Dilutive effect of stock-based compensation36 988 — 1,142 
  Weighted-average shares outstanding - diluted79,567 80,275 79,469 80,356 
Earnings (loss) from continuing operations per common share, attributable to Harsco Corporation common stockholders:
Basic$0.01 $0.06 $(1.43)$0.15 
Diluted$0.01 $0.06 $(1.43)$0.15 

The following average outstanding stock-based compensation units were not included in the computation of diluted earnings per share because the effect was either antidilutive or the market conditions for the performance share units were not met:
Three Months EndedNine Months Ended
September 30September 30
(In thousands)2022202120222021
Restricted stock units— — 763 — 
Stock appreciation rights2,062 842 2,304 719 
Performance share units1,052 1,004 1,135 902