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Reconciliation of Basic and Diluted Shares (Tables)
 3 Months Ended
Mar. 31, 2017
Earnings Per Share [Abstract]  
Reconciliation of basic and diluted shares
 
 
Three Months Ended
 
 
March 31
(In thousands, except per share amounts)
 
2017
 
2016
Income (loss) from continuing operations attributable to Harsco Corporation common stockholders
 
$
9,267

 
$
(10,550
)
 
 
 
 
 
Weighted-average shares outstanding - basic
 
80,385

 
80,238

Dilutive effect of stock-based compensation
 
1,878

 
—

Weighted-average shares outstanding - diluted
 
82,263

 
80,238

 
 
 
 
 
Earnings (loss) from continuing operations per common share, attributable to Harsco Corporation common stockholders:
Basic
 
$
0.12

 
$
(0.13
)
 
 
 
 
 
Diluted
 
$
0.11

 
$
(0.13
)
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 (loss) per share because the effect was antidilutive:
 
 
Three Months Ended
 
 
March 31
(In thousands)
 
2017
 
2016
Restricted stock units
 
—

 
430

Stock options
 
55

 
90

Stock appreciation rights
 
1,263

 
1,088

Performance share units
 
467

 
309