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Income and other taxes - Schedule of Unrecognized Tax Losses (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised $ 283,786
2019  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 6,955
2020  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 20,352
2027  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 125
2028  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 568
2029  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 4,536
2030  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 10,602
2031  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 7,809
2032  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 13,200
2033  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 5,535
2034  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 30,130
2035  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 37,226
2036  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 40,370
2037  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 35,803
2038  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 47,892
No Expiration  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 22,683
Canada  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 233,796
Canada | 2019  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Canada | 2020  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Canada | 2027  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 125
Canada | 2028  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 568
Canada | 2029  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 4,536
Canada | 2030  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 10,602
Canada | 2031  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 7,809
Canada | 2032  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 13,200
Canada | 2033  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 5,535
Canada | 2034  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 30,130
Canada | 2035  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 37,226
Canada | 2036  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 40,370
Canada | 2037  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 35,803
Canada | 2038  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 47,892
Canada | No Expiration  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Colombia  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 3,490
Colombia | 2019  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Colombia | 2020  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Colombia | 2027  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Colombia | 2028  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Colombia | 2029  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Colombia | 2030  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Colombia | 2031  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Colombia | 2032  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Colombia | 2033  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Colombia | 2034  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Colombia | 2035  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Colombia | 2036  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Colombia | 2037  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Colombia | 2038  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Colombia | No Expiration  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 3,490
Nicaragua  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 46,500
Nicaragua | 2019  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 6,955
Nicaragua | 2020  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 20,352
Nicaragua | 2027  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Nicaragua | 2028  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Nicaragua | 2029  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Nicaragua | 2030  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Nicaragua | 2031  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Nicaragua | 2032  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Nicaragua | 2033  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Nicaragua | 2034  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Nicaragua | 2035  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Nicaragua | 2036  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Nicaragua | 2037  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Nicaragua | 2038  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised 0
Nicaragua | No Expiration  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused tax losses for which no deferred tax asset recognised $ 19,193