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Asset Under Development (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
USD ($)
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]  
Opening asset under development balance $ 20,000
Closing asset under development balance 284,344
Gimi Conversion  
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]  
Opening asset under development balance 20,000
Transfer from other non-current assets (note 13) 31,048
Additions 228,509
Interest costs capitalized 4,787
Closing asset under development balance $ 284,344