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Stock-Based Compensation
 9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation
STOCK-BASED COMPENSATION
We recognize the cost of employee compensation received in the form of equity instruments based on the grant date fair value of those awards. The table below sets forth the total amount of stock-based compensation expense for the nine months and quarter ended September 30, 2017 and 2016. 
 
 
Quarter Ended  
 September 30,
 
Nine Months Ended 
 September 30,
 
 
2017
 
2016
 
2017
 
2016
 
 
(Thousands of dollars)
Stock-based compensation expense:
 
 
 
 
 
 
Time-based restricted stock units
 
$
582

 
$
631

 
$
1,678

 
$
1,847

Performance-based restricted stock units
 
689

 
823

 
1,396

 
2,502

Total stock-based compensation expense
 
$
1,271

 
$
1,454

 
$
3,074

 
$
4,349


During the quarter and nine months ended September 30, 2017, 26,296 and 472,913 time-based restricted units, respectively, and 4,646 and 371,045 performance-based restricted units were awarded to managerial employees.
During the quarter and nine months ended September 30, 2016, 10,992 and 25,280 time-based restricted units, respectively, and 2,318 and 310,481 performance-based restricted units were awarded to managerial employees, respectively.