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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Components of Basic and Diluted Earnings Per Share

The components of basic and diluted earnings per share for the quarter and six months ended June 30, 2016 and 2015 are as follows:

 

     Quarter Ended      Six Months Ended  
     June 30,      June 30,  
     2016      2015      2016      2015  
     (Thousands of dollars)  

Weighted average outstanding shares of common stock, basic

      15,677         15,574         15,650         15,574   

Dilutive effect of unvested restricted stock units

      41         116         —           105   
  

 

 

     

 

 

     

 

 

     

 

 

  

Weighted average outstanding shares of common stock, diluted (1)

      15,718         15,690         15,650         15,679   
  

 

 

     

 

 

     

 

 

     

 

 

  

 

(1) For the six months ended June 30, 2016, 3,180 unvested restricted stock units were excluded from the weighted average outstanding shares of common stock, diluted, as they were anti-dilutive to earnings per share.