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MANAGEMENT OF FINANCIAL RISK (Schedule of Company's Liquidity Risk) (Details) - USD ($)
Nov. 04, 2021
Dec. 31, 2022
Dec. 15, 2022
Dec. 14, 2022
Dec. 31, 2021
Nov. 05, 2021
Dec. 31, 2020
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Trade and other payables   $ 111,896,000     $ 133,805,000    
Debt   225,940,000     166,000,000    
Income tax payable   11,589,000     20,563,000    
Lease obligations   31,193,000     41,655,000    
Other non-current liabilities   2,596,000     3,310,000    
Cash and cash equivalents   80,493,000     107,097,000   $ 131,898,000
Operating leases   31,193,000     41,655,000    
Capital commitments   14,303,000     71,759,000    
Provisions   60,012,000     56,112,000    
Total financial liabilities   457,529,000     493,204,000    
Not later than one year [member]              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Trade and other payables   111,896,000     133,805,000    
Income tax payable   11,589,000     20,563,000    
Lease obligations   11,343,000     12,292,000    
Operating leases   11,343,000     12,292,000    
Capital commitments   13,923,000     66,542,000    
Provisions   3,227,000     1,883,000    
Total financial liabilities   151,978,000     235,085,000    
Later than one year and not later than five years [member]              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Operating leases   14,044,000     13,380,000    
Later than one year and not later than three years [member]              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Debt   225,940,000     46,000,000    
Lease obligations   8,308,000     11,315,000    
Other non-current liabilities   2,596,000     3,310,000    
Capital commitments   380,000     5,217,000    
Provisions   24,635,000     5,561,000    
Total financial liabilities   261,859,000     71,403,000    
Later than three years and not later than five years [member]              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Debt         120,000,000    
Lease obligations   5,736,000     2,065,000    
Provisions   9,110,000     23,954,000    
Total financial liabilities   14,846,000     146,019,000    
Later than five years [member]              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Lease obligations   5,806,000     15,983,000    
Operating leases   5,806,000     15,983,000    
Provisions   23,040,000     24,714,000    
Total financial liabilities   $ 28,846,000     $ 40,697,000    
Amended Credit Facility [Member]              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Borrowing capacity $ 120,000,000.0   $ 250,000,000.0 $ 200,000,000.0   $ 200,000,000.0  
Debt term 4 years            
Amended Credit Facility [Member] | After Three Years [Member]              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Borrowing capacity $ 150,000,000.0