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Reconciliation of Basic and Diluted Shares - Reconciliation of Basic and Diluted Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Income (loss) from continuing operations, net of tax	$ 14,463	$ (10,750)	$ 15,925	$ (19,532)
Weighted-average shares outstanding - basic (in shares)	79,265	78,987	79,177	78,874
Dilutive effect of stock-based compensation (in shares)	1,509	0	1,220	0
Weighted-average shares outstanding - diluted (in shares)	80,774	78,987	80,397	78,874
Earnings (loss) from continuing operations per common share, attributable to Harsco Corporation common stockholders:
Basic (in dollars per share)	$ 0.18	$ (0.14)	$ 0.20	$ (0.25)
Diluted (in dollars per share)	$ 0.18	$ (0.14)	$ 0.20	$ (0.25)

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