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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2019
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, 2019 and 2018 are as follows:

 

 

 

Quarter Ended

June 30,

 

 

Six Months Ended

June 30,

 

 

 

2019

 

 

2018

 

 

2019

 

 

2018

 

 

 

(Thousands of dollars)

 

Weighted average outstanding shares of common stock, basic

 

 

15,825

 

 

 

15,806

 

 

 

15,825

 

 

 

15,806

 

Dilutive effect of unvested restricted stock units

 

 

—

 

 

 

—

 

 

 

—

 

 

 

—

 

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

 

 

15,825

 

 

 

15,806

 

 

 

15,825

 

 

 

15,806

 

 

(1) For the quarter ended June 30, 2019 and 2018, 0 and 425,317 unvested restricted stock units were excluded from the weighted average outstanding shares of common stock, diluted, respectively, as they were anti-dilutive to earnings per share. For the six months ended June 30, 2019 and 2018, 0 and 14,258 unvested restricted stock units were excluded from the weighted average outstanding shares of common stock, diluted, respectively as they were anti-dilutive to earnings per share.