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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
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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 |  |  |  |  |  |

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