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Provisions Current and Non-current Provisions (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Provisions [abstract]      
Current $ 12,066 $ 7,372  
Non-Current 229,887 188,012  
Provisions $ 241,953 $ 195,384 $ 75,155