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Financial risk management - Maturity Analysis Financial Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables $ 153,459 $ 114,813
Borrowings 1,033,876 1,330,116
Leases Liabilities 352,361 197,526
Derivative financial instruments 1,283 13,141
Total 1,540,979 1,655,596
Less than 1 year    
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables 153,175 114,523
Borrowings 153,311 286,588
Leases Liabilities 53,384 36,714
Derivative financial instruments 1,283 13,141
Total 361,153 450,966
Between 1 and 2 years    
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables 15 15
Borrowings 57,849 132,266
Leases Liabilities 53,172 20,608
Derivative financial instruments 0 0
Total 111,036 152,889
Between 2 and 5 years    
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables 22 22
Borrowings 245,538 197,941
Leases Liabilities 122,625 74,565
Derivative financial instruments 0 0
Total 368,185 272,528
Over 5 Years    
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables 247 253
Borrowings 577,178 713,321
Leases Liabilities 123,180 65,639
Derivative financial instruments 0 0
Total $ 700,605 $ 779,213