Commitments (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Commitments [Abstract]

Disclosure of Detailed Information Of Royalties Commitments [text block]

Under Law 756 of 2002, as modified by Law 1530 of 2012, the royalties on Colombian production of light and medium oil are calculated on a field-by-field basis, using the following sliding scale:

Disclosure of finance lease and operating lease by lessee [text block]

The future aggregate minimum lease payments under non-cancellable operating leases are as follows:

Amounts in US$ ’000	2017		2016		2015
Operating lease commitments
Falling due within 1 year		32,180		67,752		12,878
Falling due within 1 – 3 years		5,777		14,031		8,257
Falling due within 3 – 5 years		2,793		5,066		2,456
Falling due over 5 years		-		114		309
Total minimum lease payments		40,750		86,963		23,900