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FINANCIAL RISK MANAGEMENT (Financial assets and liabilities at fair value) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value $ 1,432,536 $ 496,832
Financial liabilities, at fair value 1,889 6,358
Level 1    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 1,360,585 492,631
Financial liabilities, at fair value 0 0
Level 2    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 44,130 1,572
Financial liabilities, at fair value 1,889 6,358
Level 3    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 27,821 2,629
Financial liabilities, at fair value 0 0
Derivatives    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities, at fair value 1,889 6,358
Derivatives | Level 1    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities, at fair value 0 0
Derivatives | Level 2    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities, at fair value 1,889 6,358
Derivatives | Level 3    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities, at fair value 0 0
Cash and cash equivalents    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 692,529 259,020
Cash and cash equivalents | Level 1    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 692,529 259,020
Cash and cash equivalents | Level 2    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 0 0
Cash and cash equivalents | Level 3    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 0 0
Other investments    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 735,654 236,240
Other investments | Level 1    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 668,056 233,611
Other investments | Level 2    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 39,777 0
Other investments | Level 3    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 27,821 2,629
Derivatives    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 4,353 1,572
Derivatives | Level 1    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 0 0
Derivatives | Level 2    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 4,353 1,572
Derivatives | Level 3    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value $ 0 $ 0