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Earnings per Share (Tables)
12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Schedule of computations of basic and diluted earnings per share
The following table sets forth the computations of basic and diluted earnings per share:
 
For the year ended December 31,
 
For the transition period ended December 31,
 
For the year ended May 31,
 
2017
 
2016
 
2016
 
2015
Basic (loss) earnings per share
 
 
 
 
 

 
 

Numerator:
 
 
 
 
 

 
 

Net (loss) income attributable to Mistras Group, Inc.
$
(2,175
)
 
$
9,568

 
$
24,654

 
$
16,081

Denominator
 
 
 
 
 

 
 

Weighted average common shares outstanding
28,422

 
28,989

 
28,856

 
28,613

Basic (loss) earnings per share
$
(0.08
)
 
$
0.33

 
$
0.85

 
$
0.56

 
 
 
 
 
 
 
 
Diluted earnings per share:
 
 
 
 
 

 
 

Numerator:
 
 
 
 
 

 
 

Net income attributable to Mistras Group, Inc.
$
(2,175
)
 
$
9,568

 
$
24,654

 
$
16,081

Denominator
 
 
 
 
 

 
 

Weighted average common shares outstanding
28,422

 
28,989

 
28,856

 
28,613

Dilutive effect of stock options outstanding

 
791

 
712

 
719

Dilutive effect of restricted stock units outstanding

 
345

 
323

 
258

 
28,422

 
30,125

 
29,891

 
29,590

Diluted (loss) earnings per share
$
(0.08
)
 
$
0.32

 
$
0.82

 
$
0.54

Schedule of potential common shares that were excluded from the computation of diluted earnings per share
The following potential common shares were excluded from the computation of diluted earnings per share, as the effect would have been anti-dilutive:
 
 
For the year ended December 31,
 
For the transition period ended December 31,
 
For the year ended May 31,
 
2017
 
2016
 
2016
 
2015
Potential common stock attributable to stock options outstanding
810

(1 
) 

 
5

 
6

Potential common stock attributable to restricted stock units (RSUs) and performance stock units (PSUs) outstanding
353

(2 
) 
2

 
24

 
1

Total
1,163

 
2

 
29

 
7



(1) - 805 shares related to stock options were excluded from the calculation of diluted EPS due to the net loss for the period.

(2) - 351 shares related to RSUs and PSUs were excluded from the calculation of diluted EPS due to the net loss for the period.