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FINANCIAL INSTRUMENTS - Capital Structure (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial liabilities [line items]        
Cash $ 26,292 $ 16,467    
Total equity 352,248 316,682 $ 272,228 $ 261,428
Borrowings        
Disclosure of financial liabilities [line items]        
Borrowings (excluding lease liabilities) $ 510,460 $ 447,842