Reconciliation of Basic and Diluted Shares (Tables)

9 Months Ended

Sep. 30, 2019

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)	2019		2018		2019		2018
Income from continuing operations attributable to Harsco Corporation common stockholders	$	17,831	$	24,665	$	25,453	$	66,278
Weighted-average shares outstanding:
Weighted-average shares outstanding - basic	79,666		80,950		79,966		80,821
Dilutive effect of stock-based compensation	1,444		2,929		1,783		2,869
Weighted-average shares outstanding - diluted	81,110		83,879		81,749		83,690
Earnings (loss) from continuing operations per common share, attributable to Harsco Corporation common stockholders:
Basic	$	0.22	$	0.30	$	0.32	$	0.82
Diluted	$	0.22	$	0.29	$	0.31	$	0.79

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)	2019	2018	2019	2018
Stock appreciation rights	599	75	460	349
Performance share units	265	—	166	—