Capital Stock (Tables)

12 Months Ended

Dec. 31, 2019

Schedule of Common Stock Outstanding Roll Forward

The following table summarizes the Company's common stock:



	Shares Issued	Treasury Shares (a)	Outstanding Shares
Outstanding, January 1, 2017	112,499,874	32,324,911	80,174,963
Shares issued for vested restricted stock units	375,355	105,431	269,924
Stock appreciation rights exercised	12,897	3,932	8,965
Outstanding, December 31, 2017	112,888,126	32,434,274	80,453,852
Shares issued for vested restricted stock units	545,908	161,774	384,134
Stock appreciation rights exercised	39,917	11,808	28,109
Treasury shares purchased	—	1,321,072	(1,321,072	)
Outstanding, December 31, 2018	113,473,951	33,928,928	79,545,023
Shares issued for vested restricted stock units	321,965	125,863	196,102
Shares issued for vested performance stock units	908,566	379,353	529,213
Stock appreciation rights exercised	15,865	4,619	11,246
Treasury shares purchased	—	1,766,826	(1,766,826	)
Outstanding, December 31, 2019	114,720,347	36,205,589	78,514,758

(a)

The Company repurchases shares in connection with the issuance of shares under stock-based compensation programs and in accordance with Board authorized share repurchase programs.

Schedule of Earnings Per Share, Basic and Diluted

The following is a reconciliation of the average shares of common stock used to compute basic earnings per common share to the shares used to compute diluted earnings per common share as shown on the Consolidated Statements of Operations:



(In thousands, except per share data)	2019		2018		2017
Income (loss) from continuing operations attributable to Harsco Corporation common stockholders	$	28,231	$	100,578	$	(6,810	)
Weighted-average shares outstanding—basic	79,632		80,716		80,553
Dilutive effect of stock-based compensation	1,743		2,879		—
Weighted-average shares outstanding—diluted	81,375		83,595		80,553
Income (loss) from continuing operations per common share, attributable to Harsco Corporation common stockholders:
Basic	$	0.35	$	1.25	$	(0.08	)
Diluted	$	0.35	$	1.20	$	(0.08	)

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:



(In thousands)	2019	2018	2017
Restricted stock units	—	—	934
Stock options	—	—	52
Stock appreciation rights	491	306	1,737
Performance share units	124	—	948