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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of stock based compensation cost
The following table summarizes stock-based compensation costs for the three and six months ended June 30, 2020 and 2019 (in thousands of dollars):
Three Months Ended
June 30,		Six Months Ended
June 30,
2020201920202019
Restricted stock awards
$361  $381  $786  $621  
Restricted stock time-based unit awards
7,554  4,171  12,714  7,224  
Non-qualified stock options
468  675  704  1,355  
Restricted stock performance-based unit awards
1,140  410  2,199  437  
Equity-based compensation cost
9,523  5,637  16,403  9,637  
Tax Benefit
(2,287) (1,360) (3,938) (2,341) 
Equity-based compensation cost, net of tax
$7,236  $4,277  $12,465  $7,296