Provisions and other long-term liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Provisions and other long-term liabilities [Abstract]

Disclosure of detailed information about provisions and other long-term liabilities [text block]

Amounts in US$ ‘000	Asset retirement obligation		Deferred Income		Other		Total
At 1 January 2016		31,617		5,033		5,800		42,450
Addition to provision		1,195		1,375		2,686		5,256
Recovery of abandonments costs		(5,504)		-		-		(5,504)
Exchange difference		(1,614)		-		538		(1,076)
Foreign currency translation		1,614		-		-		1,614
Amortisation		-		(2,924)		-		(2,924)
Unwinding of discount		2,554		-		139		2,693
At 31 December 2016		29,862		3,484		9,163		42,509
Addition to provision		5,943		-		2,220		8,163
Exchange difference		134		-		1,154		1,288
Foreign currency translation		(134)		-		-		(134)
Amortisation		-		(657)		-		(657)
Unwinding of discount		2,607		-		172		2,779
Unused amounts reversed		-		-		(2,535)		(2,535)
Amounts used during the year		(337)		(1,375)		(3,417)		(5,129)
At 31 December 2017		38,075		1,452		6,757		46,284