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Transactions in foreign currency (Tables)
 12 Months Ended
Dec. 31, 2017
Transactions In Foreign Currency  
Schedule of assets and liabilities in United States dollars

As of December 31, 2017 and 2016, the Group had the following assets and liabilities in United States dollars:

 

    2017     2016  
      US$(000)       US$(000)  
                 
Assets                
Cash and cash equivalents     1,157       3,371  
Trade and other receivables     7,764       5,517  
Advances to suppliers for work in progress     5,534       2,733  
Assets held for distribution     —       1,885  
      14,455       13,506  
                 
Liabilities                
Trade and other payables     (18,274 )     (15,224 )
Liabilities held for distribution     —       (379 )
Interest-bearing loans and borrowings     (300,000 )     (300,000 )
      (318,274 )     (315,603 )
                 
      (303,819 )     (302,097 )
Cross currency swap position     300,000       300,000  
                 
Net monetary position     (3,819 )     (2,097 )