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EARNINGS PER SHARE (Tables)
6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Schedule of Calculation of Earnings Per Basic and Diluted Shares The Company uses the treasury stock method to calculate earnings per share as shown in the following table (in thousands, except per share amounts):
 Three Months Ended June 30,Six Months Ended June 30,
 2021202020212020
Net income (loss)$(25,319)$(38,902)$(25,438)$39,649 
Basic net income (loss) per common share$(0.83)$(1.87)$(0.99)$1.91 
Diluted net income (loss) per common share$(0.83)$(1.87)$(0.99)$1.91 
Weighted-average shares outstanding - basic30,655 20,776 25,774 20,713 
Add: dilutive effect of contingent stock awards— — — 46 
Weighted-average shares outstanding - diluted30,655 20,776 25,774 20,759