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Income Per Share
3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Income Per Share INCOME (LOSS) PER SHARE

Basic per share amounts were computed using the weighted average number of common shares outstanding. Diluted per share amounts were calculated using the number of basic weighted average shares outstanding increased by dilutive potential common shares related to stock-based awards, as determined by the treasury stock method. The weighted average numbers of shares outstanding used to compute income (loss) per share were as follows (in thousands):
 
 
Three Months Ended March 31,
 
 
2019
 
2018
Shares used to calculate basic income (loss) per share
 
29,573

 
30,314

Dilutive effect of outstanding stock options, performance stock units and restricted stock units
 

 
277

Shares used to calculate diluted income (loss) per share
 
29,573

 
30,591



The weighted average numbers of shares outstanding listed in the table below were anti-dilutive and excluded from the computation of diluted income per share. In the case of stock options, this is because the average market price did not exceed the exercise price.
 
 
Three Months Ended March 31,
 
 
2019
 
2018
Stock options
 
30

 

Restricted stock units
 
39

 


In the case of restricted stock units, this is because unrecognized compensation expense exceeds the current value of the awards (i.e., grant date market value was higher than current average market price). These shares may be dilutive potential common shares in the future (in thousands):
 
 
Three Months Ended March 31,
 
 
2019
 
2018
Stock options
 
91

 
13

Restricted stock units
 
341

 
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