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Consolidated Statement of Cash Flow (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure Of Consolidated Statement Of Cash Flow [Abstract]  
Disclosure Of Detailed Information About Non-cash Transaction Cash Flow [text block]
The following chart describes non-cash transactions related to the Consolidated Statement of Cash Flow:
 
Amounts in US$ '000
 
2018
 
 
2017
 
 
2016
 
(Decrease) Increase in asset retirement obligation
 
 
(4,355
)
 
 
5,943
 
 
 
1,195
 
(Decrease) Increase in provisions for other long-term liabilities
 
 
(60
)
 
 
2,053
 
 
 
3,468
 
Purchase of property, plant and equipment
 
 
1,100
 
 
 
11,759
 
 
 
(4,657
)
Disclosure Of Detailed Information About Changes In Working Capital [text block]
Changes in working capital shown in the Consolidated Statement of Cash Flow are disclosed as follows:
 
Amounts in US$ '000
 
2018
 
 
2017
 
 
2016
 
Increase in Prepaid taxes
 
 
(36,716
)
 
 
(14,802
)
 
 
(2,351
)
Decrease (Increase) in Inventories
 
 
511
 
 
 
(2,031
)
 
 
466
 
Decrease (Increase) in Trade receivables
 
 
3,423
 
 
 
(1,344
)
 
 
(4,811
)
Decrease (Increase) in Prepayments and other receivables and Other assets
 
 
655
 
 
 
(8,623
)
 
 
(1,758
)
Customer advance (repayments) payments
(a)
 
 
(10,000
)
 
 
(10,000
)
 
 
20,000
 
Security deposit utilised (granted) (Note 35.3)
 
 
15,600
 
 
 
(15,600
)
 
 
-
 
Increase in Trade and other payables
 
 
20,169
 
 
 
27,122
 
 
 
374
 
 
 
 
(6,358
)
 
 
(25,278
)
 
 
11,920
 
 
 
(a)
In December 2015, the Colombian subsidiary entered into a prepayment agreement with Trafigura under which GeoPark sells and deliver a portion of its Colombian crude oil production. Funds committed were repaid by the Group on a monthly basis through future oil deliveries until December 2018.