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Financial risk management - Maturity Analysis Financial Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables $ 96,167 $ 86,066
Total debt 1,188,542 1,148,554
Derivative financial instruments 283 552
Total 1,284,992 1,235,172
Less than 1 year    
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables 95,956 85,239
Total debt 190,671 197,975
Derivative financial instruments 258 552
Total 286,885 283,766
Between 1 and 2 years    
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables 6 557
Total debt 74,478 96,867
Derivative financial instruments 25 0
Total 74,509 97,424
Between 2 and 5 years    
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables 18 49
Total debt 286,557 56,486
Derivative financial instruments 0 0
Total 286,575 56,535
Over 5 Years    
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables 187 221
Total debt 636,836 797,226
Derivative financial instruments 0 0
Total $ 637,023 $ 797,447