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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Computation of Basic and Diluted Earnings Per Share
The following table shows the computation of basic and diluted earnings per share for the years ended December 31, 2019, 2018 and 2017:
In thousands, except per share amounts
 
Year ended December 31,
 
 
2019
 
2018
 
2017
Numerator:
 
 
 
 
 
 
Net (loss) income attributable to U.S. Silica Holdings, Inc.
 
$
(329,082
)
 
$
(200,808
)
 
$
145,206

 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
Weighted average shares outstanding
 
73,253

 
76,453

 
81,051

Diluted effect of stock awards
 
—

 
—

 
909

Weighted average shares outstanding assuming dilution
 
73,253

 
76,453

 
81,960

 
 
 
 
 
 
 
(Loss) earnings per share attributable to U.S. Silica Holdings, Inc.:
 
 
 
 
 
 
Basic (loss) earnings per share
 
$
(4.49
)
 
$
(2.63
)
 
$
1.79

Diluted (loss) earnings per share
 
$
(4.49
)
 
$
(2.63
)
 
$
1.77
Schedule of Antidilutive Securities Excluded from Computation of Diluted Earnings Per Share Certain stock options, restricted stock awards and performance share units were excluded from the computation of diluted earnings per share because their effect would have been anti-dilutive. Such stock awards (in thousands) excluded from the calculation of diluted earnings (loss) per common share were as follows:
 
 
Year ended December 31,
 
 
2019
 
2018
 
2017
Stock options excluded
 
711

 
574

 
195

Restricted stock and performance share units awards excluded
 
1,298

 
155

 
305