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CAPITAL STOCK - Summary of Stock Option (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Options      
Beginning balance (in shares) 1,508,325 1,548,825 1,456,200
Grants (in shares) 37,500 296,500 205,750
Exercises (in shares) (2,500) (75,000) (58,000)
Cancellations (in shares) (14,313) (19,625) (22,375)
Expirations (in shares) (242,112) (242,375) (32,750)
Ending balance (in shares) 1,286,900 1,508,325 1,548,825
Options exercisable at End of Period (in shares) 986,607    
Weighted- average exercise price      
Beginning balance (usd per share) $ 13.43 $ 13.87 $ 13.64
Grants (usd per share) 6.36 9.21 13.56
Exercised (usd per share) 10.79 4.28 4.93
Cancellations (usd per share) 11.09 12.94 16.95
Expirations (usd per share) 13.27 13.95 15.50
Ending balance (usd per share) 13.28 $ 13.43 $ 13.87
Options exercisable at End of Period (usd per share) $ 14.27    
Weighted- average remaining contractual life (years)      
Options outstanding, ending balance 4 years 8 months 12 days    
Options exercisable, ending balance 3 years 8 months 12 days    
Aggregate intrinsic value      
Options outstanding, end of period $ 3,604    
Options exercisable, end of period $ 2,035