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Reconciliation of Basic and Diluted Shares (Tables)
 9 Months Ended
Sep. 30, 2017
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)
 
2017
 
2016
 
2017
 
2016
Income (loss) from continuing operations attributable to Harsco Corporation common stockholders
 
$
13,669

 
$
(32,612
)
 
$
41,571

 
$
(71,156
)
 
 
 
 
 
 
 
 
 
Weighted-average shares outstanding - basic
 
80,637

 
80,379

 
80,519

 
80,318

Dilutive effect of stock-based compensation
 
2,499

 
—

 
2,234

 
—

Weighted-average shares outstanding - diluted
 
83,136

 
80,379

 
82,753

 
80,318

 
 
 
 
 
 
 
 
 
Earnings (loss) from continuing operations per common share, attributable to Harsco Corporation common stockholders:
Basic
 
$
0.17

 
$
(0.41
)
 
$
0.52

 
$
(0.89
)
 
 
 
 
 
 
 
 
 
Diluted
 
$
0.16

 
$
(0.41
)
 
$
0.50

 
$
(0.89
)
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
 
Nine Months Ended
 
 
September 30
 
September 30
(In thousands)
 
2017
 
2016
 
2017
 
2016
Restricted stock units
 
—

 
922

 
—

 
770

Stock options
 
55

 
90

 
55

 
90

Stock appreciation rights
 
526

 
1,567

 
918

 
1,432

Performance share units
 
—

 
801

 
212

 
649