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Segment information - Total reportable segments' assets and liabilities reconciliation to total assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of operating segments [line items]        
Total reportable assets as per segment information $ 1,112,527 $ 1,075,837    
Total reportable assets as per segment information 1,607,201 1,455,766    
Deferred income tax assets 43,437 38,586    
Trade and other receivables 172,214 174,940    
Cash and cash equivalents 269,195 158,568 $ 198,894 $ 113,795
TOTAL ASSETS 1,607,201 1,455,766    
Total reportable liabilities as per segment information 817,958 635,396    
Trade and other payables 99,250 93,585    
Deferred income tax liabilities 10,457 14,689    
Payroll and social liabilities 28,507 28,079    
Current income tax liabilities 4,843 3,889 $ 2,313  
Current income tax liabilities 6,462 4,685    
TOTAL LIABILITIES 962,070 784,093    
Elimination of intersegment amounts        
Disclosure of operating segments [line items]        
Total reportable assets as per segment information 1,112,527 1,075,837    
Intangible assets (excluding goodwill) 4,780 3,847    
Deferred income tax assets 43,437 38,586    
Trade and other receivables 172,214 174,940    
Other assets 565 590    
Derivative financial instruments 4,483 3,398    
Cash and cash equivalents 269,195 158,568    
Total reportable liabilities as per segment information 817,958 635,396    
Trade and other payables 99,250 93,585    
Deferred income tax liabilities 10,457 14,689    
Payroll and social liabilities 28,507 28,079    
Current income tax liabilities 4,843 3,889    
Current income tax liabilities 503 1,387    
Derivative financial instruments $ 552 $ 7,068