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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Summary of Share Based Compensation Expense The table below sets forth the total amount of stock-based compensation expense for the quarter and six months ended June 30, 2019 and 2018.

 

 

Quarter Ended

June 30,

 

 

Six Months Ended

June 30,

 

 

 

2019

 

 

2018

 

 

2019

 

 

2018

 

 

 

(Thousands of dollars)

 

Stock-based compensation expense:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Time-based restricted stock units

 

$

845

 

 

$

435

 

 

$

1,685

 

 

$

1,077

 

Performance-based restricted stock units

 

 

480

 

 

 

378

 

 

 

955

 

 

 

1,055

 

Total stock-based compensation expense

 

$

1,325

 

 

$

813

 

 

$

2,640

 

 

$

2,132