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Provisions and other long-term liabilities (Tables)
 12 Months Ended
Dec. 31, 2018
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 2017
 
 
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
)
Amortization
 
 
-
 
 
 
(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
 
Addition to provision
 
 
462
 
 
 
-
 
 
 
1,039
 
 
 
1,501
 
Recovery of abandonment costs
 
 
(4,817
)
 
 
-
 
 
 
(1,099
)
 
 
(5,916
)
Acquisitions
 
 
9,738
 
 
 
-
 
 
 
-
 
 
 
9,738
 
Exchange difference
 
 
1,823
 
 
 
-
 
 
 
(46
)
 
 
1,777
 
Foreign currency translation
 
 
(1,648
)
 
 
-
 
 
 
-
 
 
 
(1,648
)
Amortization
 
 
-
 
 
 
(1,005
)
 
 
-
 
 
 
(1,005
)
Unwinding of discount
 
 
3,250
 
 
 
-
 
 
 
173
 
 
 
3,423
 
Unused amounts reversed
 
 
-
 
 
 
-
 
 
 
(2,093
)
 
 
(2,093
)
Amounts used during the year
 
 
(750
)
 
 
-
 
 
 
(124
)
 
 
(874
)
Liabilities associated with assets held for sale
 
 
(5,816
)
 
 
-
 
 
 
(2,794
)
 
 
(8,610
)
At 31 December 2018
 
 
40,317
 
 
 
447
 
 
 
1,813
 
 
 
42,577