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Financial instruments by category - Carrying amounts of financial assets and financial liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets as per statement of financial position          
Trade and other receivables $ 172,331   $ 197,506    
Derivative financial instruments 1,435   6,286    
Cash and cash equivalents 290,276   273,635 $ 269,195 $ 158,568
Total 464,042   477,427    
Liabilities as per statement of financial position          
Trade and other payables 110,486   106,437    
Borrowings (excluding finance lease liabilities) 968,280   861,521    
Finance leases   $ 595 595    
Leases Liabilities 216,384 $ 178,143 0    
Derivative financial instruments 1,423   283    
Total 1,296,573   968,836    
Financial Liability Instrument          
Liabilities as per statement of financial position          
Trade and other payables 98,420   96,167    
Borrowings (excluding finance lease liabilities) 968,280   861,521    
Finance leases     595    
Leases Liabilities 216,384        
Derivative financial instruments 1,423   283    
Total 1,284,507   958,566    
Non- financial liabilities          
Liabilities as per statement of financial position          
Trade and other payables 12,066   10,270    
Borrowings (excluding finance lease liabilities) 0   0    
Finance leases     0    
Leases Liabilities 0        
Derivative financial instruments 0   0    
Total 12,066   10,270    
Liabilities at fair value through profit or loss | Financial Liability Instrument          
Liabilities as per statement of financial position          
Trade and other payables 0   0    
Borrowings (excluding finance lease liabilities) 0   0    
Finance leases     0    
Leases Liabilities 0        
Derivative financial instruments 1,423   283    
Total 1,423   283    
Financial liabilities at amortized cost | Financial Liability Instrument          
Liabilities as per statement of financial position          
Trade and other payables 98,420   96,167    
Borrowings (excluding finance lease liabilities) 968,280   861,521    
Finance leases     595    
Leases Liabilities 216,384        
Derivative financial instruments 0   0    
Total 1,283,084   958,283    
Financial Assets Instruments          
Assets as per statement of financial position          
Trade and other receivables 88,113   91,183    
Derivative financial instruments 1,435   6,286    
Cash and cash equivalents 290,276   273,635    
Total 379,824   371,104    
Financial Assets Instruments | Financial asset at amortized cost          
Assets as per statement of financial position          
Trade and other receivables 88,113   91,183    
Derivative financial instruments 0   0    
Cash and cash equivalents 290,276   273,635    
Total 378,389   364,818    
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 1,435   6,286    
Cash and cash equivalents 0   0    
Total 1,435   6,286    
Non- financial assets          
Assets as per statement of financial position          
Trade and other receivables 84,218   106,323    
Derivative financial instruments 0   0    
Cash and cash equivalents 0   0    
Total $ 84,218   $ 106,323