Revenue (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure Of Revenue [Abstract]

Disclosure Of Detailed Information On Revenue [text block]

Amounts in US$ '000	2018		2017		2016
Sale of crude oil		545,490		279,162		145,193
Sale of gas		55,671		50,960		47,477
		601,161		330,122		192,670