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Net Income (Loss) Per Share (Tables)
6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Basic and Diluted Net Income Per Share
Reconciliation of the shares used in the basic and diluted earnings per share computations for the three and six months ended June 30, 2018 and June 30, 2017 are as follows (in thousands):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2018
 
2017
 
2018
 
2017
Basic weighted average shares outstanding
 
48,487

 
48,140

 
48,406

 
48,104

Add effects of share-based compensation instruments (1)
 
851

 
163

 
857

 
137

Diluted weighted average shares outstanding
 
49,338

 
48,303

 
49,263

 
48,241


(1)
Excluded from the computation of diluted earnings per share were stock options, SARs and restricted share units totaling 0.7 million and 1.8 million shares as of June 30, 2018 and June 30, 2017, respectively, because to include them would be anti-dilutive.