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Other income & finance costs Other income & finance costs - Finance Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of other income & finance costs [Line Items]    
Asset retirement obligation accretion $ 2,532 $ 2,038
Capitalized interest paid 3,848 36,750
Interest expense on lease liabilities 1,828 407
Other interest and financing costs 3,196 3,192
Total finance costs 49,114 42,387
Less: Capitalized interest 3,848 36,750
Finance costs 45,266 5,637
Senior Secured Notes due 2024    
Disclosure of other income & finance costs [Line Items]    
Capitalized interest paid 18,087 0
Term loan    
Disclosure of other income & finance costs [Line Items]    
Capitalized interest paid 6,611 0
Senior notes    
Disclosure of other income & finance costs [Line Items]    
Capitalized interest paid 17,525 36,750
Senior Notes 1 and Revolving Credit Facility 1    
Disclosure of other income & finance costs [Line Items]    
Write-off of unamortized transaction costs of 2012 notes and ARCA (note 16(b)) 3,559 0
Redemption option derivative asset    
Disclosure of other income & finance costs [Line Items]    
Redemption option derivative gain (note 16(a)) $ (4,224) $ 0