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Financial instruments by category - Carrying amounts of financial assets and financial liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
 [1],[2]
Dec. 31, 2015
 [1]
Assets as per statement of financial position        
Trade and other receivables $ 197,506 $ 172,214    
Derivative financial instruments 6,286 4,483    
Cash and cash equivalents 273,635 269,195 [1],[2] $ 158,568 $ 198,894
Total 477,427 445,892    
Liabilities as per statement of financial position        
Trade and other payables 106,437 99,250    
Borrowings (excluding finance lease liabilities) 861,521 817,853    
Finance leases 595 105    
Derivative financial instruments 283 552    
Total 968,836 917,760    
Financial Liability Instrument        
Liabilities as per statement of financial position        
Trade and other payables 96,167 86,066    
Borrowings (excluding finance lease liabilities) 861,521 817,853    
Finance leases 595 105    
Derivative financial instruments 283 552    
Total 958,566 904,576    
Non- financial liabilities        
Liabilities as per statement of financial position        
Trade and other payables 10,270 13,184    
Borrowings (excluding finance lease liabilities) 0 0    
Finance leases 0 0    
Derivative financial instruments 0 0    
Total 10,270 13,184    
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 0    
Derivative financial instruments 283 552    
Total 283 552    
Financial liabilities at amortized cost | Financial Liability Instrument        
Liabilities as per statement of financial position        
Trade and other payables 96,167 86,066    
Borrowings (excluding finance lease liabilities) 861,521 817,853    
Finance leases 595 105    
Derivative financial instruments 0 0    
Total 958,283 904,024    
Financial Assets Instruments        
Assets as per statement of financial position        
Trade and other receivables 91,183 68,869    
Derivative financial instruments 6,286 4,483    
Cash and cash equivalents 273,635 269,195    
Total 371,104 342,547    
Financial Assets Instruments | Financial asset at amortized cost        
Assets as per statement of financial position        
Trade and other receivables 91,183 68,869    
Derivative financial instruments 0 0    
Cash and cash equivalents 273,635 269,195    
Total 364,818 338,064    
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 6,286 4,483    
Cash and cash equivalents 0 0    
Total 6,286 4,483    
Non- financial assets        
Assets as per statement of financial position        
Trade and other receivables 106,323 103,345    
Derivative financial instruments 0 0    
Cash and cash equivalents 0 0    
Total $ 106,323 $ 103,345    
[1] Prior periods have been recast to reflect the Company's change in accounting policy for Investment properties as described in Note 33.
[2] Prior periods have been recast to reflect the Company's change in accounting policy for Investment properties as in Note 33.