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Other income & finance costs - Other Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Analysis of income and expense [abstract]    
Gain on disposal of assets $ 656 $ 130
Interest and other income 3,154 16,151
Income from royalty sale 8,075 0
Other income $ 11,885 $ 16,281