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CAPITAL STOCK - Summary of Stock Option (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Options      
Beginning balance (in shares) 1,548,825 1,456,200 1,775,400
Grants (in shares) 296,500 205,750 125,750
Exercises (in shares) (75,000) (58,000) (300,000)
Cancellations (in shares) (19,625) (22,375) (45,700)
Expirations (in shares) (242,375) (32,750) (99,250)
Ending balance (in shares) 1,508,325 1,548,825 1,456,200
Options exercisable at End of Period (in shares) 1,065,422    
Weighted-average exercise price      
Beginning balance (usd per share) $ 13.87 $ 13.64 $ 13.44
Grants (usd per share) 9.21 13.56 17.38
Exercised (usd per share) 4.28 4.93 11.34
Cancellations (usd per share) 12.94 16.95 16.40
Expirations (usd per share) 13.95 15.50 20.40
Ending balance (usd per share) 13.43 $ 13.87 $ 13.64
Options exercisable at End of Period (usd per share) $ 14.48    
Weighted-average remaining contractual life (years)      
Options outstanding, ending balance 4 years 10 months 24 days    
Options exercisable, ending balance 3 years 1 month 6 days    
Aggregate intrinsic value      
Options outstanding, end of period $ 0    
Options exercisable, end of period $ 0