Reconciliation of Basic and Diluted Shares (Tables)

6 Months Ended

Jun. 30, 2020

Earnings Per Share [Abstract]

Reconciliation of basic and diluted shares

	Three Months Ended				Six Months Ended
	June 30				June 30
(In thousands, except per share amounts)	2020		2019		2020		2019
Income (loss) from continuing operations attributable to Harsco Corporation common stockholders	$	(10,750)	$	(2,852)	$	(19,532)	$	7,622
Weighted-average shares outstanding:
Weighted-average shares outstanding - basic	78,987		80,328		78,874		80,119
Dilutive effect of stock-based compensation	—		—		—		1,955
Weighted-average shares outstanding - diluted	78,987		80,328		78,874		82,074
Earnings (loss) from continuing operations per common share, attributable to Harsco Corporation common stockholders:
Basic	$	(0.14)	$	(0.04)	$	(0.25)	$	0.10
Diluted	$	(0.14)	$	(0.04)	$	(0.25)	$	0.09

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		Six Months Ended
	June 30		June 30
(In thousands)	2020	2019	2020	2019
Restricted stock units	739	443	744	—
Stock appreciation rights	2,472	1,919	2,558	389
Performance share units	896	685	918	116