FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Disclosure of detailed information about financial assets and liabilities measured at fair value on a recurring basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of fair value measurement of assets [line items]      
Investments $ 11,200 $ 4,767 $ 69
Deferred share units 5,682 $ 6,389  
Total [Member]      
Disclosure of fair value measurement of assets [line items]      
Investments 11,200    
Trade and other receivables 14,462    
Total financial assets 25,662    
Deferred share units 5,682    
Total financial liabilities 5,795    
Level 1 [Member]      
Disclosure of fair value measurement of assets [line items]      
Investments 11,151    
Trade and other receivables 9,711    
Total financial assets 20,862    
Deferred share units 5,682    
Total financial liabilities 5,682    
Level 2 [Member]      
Disclosure of fair value measurement of assets [line items]      
Investments 0    
Trade and other receivables 4,751    
Total financial assets 4,751    
Deferred share units 0    
Total financial liabilities 113    
Level 3 [Member]      
Disclosure of fair value measurement of assets [line items]      
Investments 49    
Trade and other receivables 0    
Total financial assets 49    
Deferred share units 0    
Total financial liabilities $ 0