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Financial instruments by category - Carrying amounts of financial assets and financial liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Assets as per statement of financial position        
Trade and other receivables $ 172,214 $ 174,940    
Derivative financial instruments 4,483 3,398    
Cash and cash equivalents 269,195 158,568 $ 198,894 $ 113,795
Total 445,892 336,906    
Liabilities as per statement of financial position        
Trade and other payables 99,250 93,585    
Borrowings (excluding finance lease liabilities) 817,853 635,215    
Finance leases 105 181    
Derivative financial instruments 552 7,068    
Total 917,760 736,049    
Non- financial liabilities        
Liabilities as per statement of financial position        
Trade and other payables 13,184 12,443    
Total 13,184 12,443    
Financial Liability Instrument        
Liabilities as per statement of financial position        
Trade and other payables 86,066 81,142    
Borrowings (excluding finance lease liabilities) 817,853 635,215    
Finance leases 105 181    
Derivative financial instruments 552 7,068    
Total 904,576 723,606    
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 552 7,068    
Total 552 7,068    
Other financial liabilities at amortized cost | Financial Liability Instrument        
Liabilities as per statement of financial position        
Trade and other payables 86,066 81,142    
Borrowings (excluding finance lease liabilities) 817,853 635,215    
Finance leases 105 181    
Derivative financial instruments 0 0    
Total 904,024 716,538    
Non- financial assets        
Assets as per statement of financial position        
Trade and other receivables 103,345 94,976    
Total 103,345 94,976    
Financial Assets Instruments        
Assets as per statement of financial position        
Trade and other receivables 68,869 79,964    
Derivative financial instruments 4,483 3,398    
Cash and cash equivalents 269,195 158,568    
Total 342,547 241,930    
Financial Assets Instruments | Loans and receivables        
Assets as per statement of financial position        
Trade and other receivables 68,869 79,964    
Derivative financial instruments 0 0    
Cash and cash equivalents 269,195 158,568    
Total 338,064 238,532    
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 4,483 3,398    
Cash and cash equivalents 0 0    
Total $ 4,483 $ 3,398