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Financial instruments by category - Carrying amounts of financial assets and financial liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
 [1]
Assets as per statement of financial position          
Trade and other receivables $ 197,928 $ 172,331      
Derivative financial instruments 2,102 1,435      
Cash and cash equivalents 336,282 290,276 [1],[2]   $ 273,635 [1] $ 269,195
Total 536,312 464,042      
Liabilities as per statement of financial position          
Trade and other payables 126,605 110,486      
Total debt 971,090 968,280   862,116  
Lease liabilities 195,772 216,384 $ 178,143 $ 0  
Derivative financial instruments 13,141 1,423      
Total 1,306,608 1,296,573      
Financial Liability Instrument          
Liabilities as per statement of financial position          
Trade and other payables 114,813 98,420      
Total debt 971,090 968,280      
Lease liabilities 195,772 216,384      
Derivative financial instruments 13,141 1,423      
Total 1,294,816 1,284,507      
Non- financial liabilities          
Liabilities as per statement of financial position          
Trade and other payables 11,792 12,066      
Total debt 0 0      
Lease liabilities 0 0      
Derivative financial instruments 0 0      
Total 11,792 12,066      
Liabilities at fair value through profit or loss | Financial Liability Instrument          
Liabilities as per statement of financial position          
Trade and other payables 0 0      
Total debt 0 0      
Lease liabilities 0 0      
Derivative financial instruments 13,141 1,423      
Total 13,141 1,423      
Financial liabilities at amortized cost | Financial Liability Instrument          
Liabilities as per statement of financial position          
Trade and other payables 114,813 98,420      
Total debt 971,090 968,280      
Lease liabilities 195,772 216,384      
Derivative financial instruments 0 0      
Total 1,281,675 1,283,084      
Financial Assets Instruments          
Assets as per statement of financial position          
Trade and other receivables 109,231 88,113      
Derivative financial instruments 2,102 1,435      
Cash and cash equivalents 336,282 290,276      
Total 447,615 379,824      
Financial Assets Instruments | Financial asset / liabilities at amortized cost          
Assets as per statement of financial position          
Trade and other receivables 109,231 88,113      
Derivative financial instruments 0 0      
Cash and cash equivalents 336,282 290,276      
Total 445,513 378,389      
Financial Assets Instruments | Assets at fair value through profit or loss          
Assets as per statement of financial position          
Trade and other receivables 0 0      
Derivative financial instruments 2,102 1,435      
Cash and cash equivalents 0 0      
Total 2,102 1,435      
Non- financial assets          
Assets as per statement of financial position          
Trade and other receivables 88,697 84,218      
Derivative financial instruments 0 0      
Cash and cash equivalents 0 0      
Total $ 88,697 $ 84,218      
[1] Prior periods have been recast to reflect the Company's change in accounting policy for the reclassification within financial results as explained in Note 34.1
[2] Prior periods have been recast to reflect the Company's change in accounting policy for the reclassification within shareholders equity of the initial application of IAS 29 as explained in Note 34.1.