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FINANCIAL INSTRUMENTS - Capital Structure (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial liabilities [line items]        
Cash $ 16,467 $ 7,047    
Total equity 316,682 272,228 $ 261,428 $ 254,722
Borrowings        
Disclosure of financial liabilities [line items]        
Borrowings (excluding lease liabilities) $ 447,842 $ 464,054