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Financial risk management - Maturity Analysis Financial Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables $ 86,066 $ 81,142
Total debt 1,148,554 715,043
Derivative financial instruments 552 7,068
Total 1,235,172 803,253
Less than 1 year    
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables 85,239 79,715
Total debt 197,975 239,588
Derivative financial instruments 552 6,406
Total 283,766 325,709
Between 1 and 2 years    
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables 557 1,082
Total debt 96,867 218,717
Derivative financial instruments 0 662
Total 97,424 220,461
Between 2 and 5 years    
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables 49 19
Total debt 56,486 221,036
Derivative financial instruments 0 0
Total 56,535 221,055
Over 5 Years    
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables 221 326
Total debt 797,226 35,702
Derivative financial instruments 0 0
Total $ 797,447 $ 36,028