Reconciliation of Basic and Diluted Shares (Tables)

6 Months Ended

Jun. 30, 2019

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)	2019			2018		2019		2018
Income (loss) from continuing operations attributable to Harsco Corporation common stockholders	$	(2,852	)	$	31,110	$	7,622	$	41,613
Weighted-average shares outstanding:
Weighted-average shares outstanding - basic	80,328			80,861		80,119		80,756
Dilutive effect of stock-based compensation	—			2,782		1,955		2,838
Weighted-average shares outstanding - diluted	80,328			83,643		82,074		83,594
Earnings (loss) from continuing operations per common share, attributable to Harsco Corporation common stockholders:
Basic	$	(0.04	)	$	0.38	$	0.10	$	0.52
Diluted	$	(0.04	)	$	0.37	$	0.09	$	0.50

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)	2019	2018	2019	2018
Restricted stock units	443	—	—	—
Stock appreciation rights	1,919	283	389	489
Performance share units	685	—	116	—