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Financial assets - Disclosure of detailed information about redeemable preference shares with no fixed redemption date (Details) - Redeemable preference shares with no fixed redemption date [Member] - JV Finco [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Financial assets [Line Items]    
Balance, beginning of year $ 153,651 $ 0
Initial recognition of preferred shares at fair value   148,850
Fair value adjustment for the year (35,626) 4,801
Redemption of preferred shares during the year (10,000)  
Balance, end of year $ 108,025 $ 153,651