Reconciliation of Basic and Diluted Shares (Tables)

9 Months Ended

Sep. 30, 2020

Earnings Per Share [Abstract]

Reconciliation of basic and diluted shares

	Three Months Ended				Nine Months Ended
	September 30				September 30
(In thousands, except per share amounts)	2020		2019		2020		2019
Income (loss) from continuing operations attributable to Harsco Corporation common stockholders	$	(7,843)	$	17,831	$	(27,375)	$	25,453
Weighted-average shares outstanding:
Weighted-average shares outstanding - basic	79,000		79,666		78,916		79,966
Dilutive effect of stock-based compensation	—		1,444		—		1,783
Weighted-average shares outstanding - diluted	79,000		81,110		78,916		81,749
Earnings (loss) from continuing operations per common share, attributable to Harsco Corporation common stockholders:
Basic	$	(0.10)	$	0.22	$	(0.35)	$	0.32
Diluted	$	(0.10)	$	0.22	$	(0.35)	$	0.31

Schedule of antidilutive securities excluded from computation of earnings per share

The following average outstanding stock-based compensation units were not included in the computation of diluted earnings per share because the effect was antidilutive:

	Three Months Ended		Nine Months Ended
	September 30		September 30
(In thousands)	2020	2019	2020	2019
Restricted stock units	691	—	723	—
Stock appreciation rights	2,383	599	2,499	460
Performance share units	857	265	894	166