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Financial instruments per category - All levels of Fair Value Hierarchy (Details) - Non-current Interest bearing liabilities (excluding Non-current lease liabilities)
$ in Thousands
Dec. 31, 2020
USD ($)
Disclosure of fair value measurement of liabilities [line items]  
Carrying Amount $ 61,675
Level 2  
Disclosure of fair value measurement of liabilities [line items]  
Fair values $ 61,675