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Financial - risk management objectives and policies (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities $ 587,062 $ 633,083 $ 592,342 $ 353,710
Not later than one year [member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities 349,607 454,726    
Later than one year and not later than two years [member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities 375,399 149,381    
Later ThanTwo Year And Not LaterThan Five Year Member [Member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities 207,391 458,969    
Later than five years [member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities 32,472 28,469    
Bank loans [member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities 95,613 96,580    
Bank loans [member] | Not later than one year [member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities 95,613 96,580    
Bank loans [member] | Later than one year and not later than two years [member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities 0 0    
Bank loans [member] | Later ThanTwo Year And Not LaterThan Five Year Member [Member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities 0 0    
Bank loans [member] | Later than five years [member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities 0 0    
Trade and other payables [member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities 177,450 220,042    
Trade and other payables [member] | Not later than one year [member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities 176,811 219,379    
Trade and other payables [member] | Later than one year and not later than two years [member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities 639 663    
Trade and other payables [member] | Later ThanTwo Year And Not LaterThan Five Year Member [Member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities 0 0    
Trade and other payables [member] | Later than five years [member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities 0 0    
Derivative financial instruments [member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities   28,705    
Derivative financial instruments [member] | Not later than one year [member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities   28,705    
Derivative financial instruments [member] | Later than one year and not later than two years [member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities   0    
Derivative financial instruments [member] | Later ThanTwo Year And Not LaterThan Five Year Member [Member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities   0    
Derivative financial instruments [member] | Later than five years [member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities   0    
Financial obligation [member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities 653,430 708,469    
Financial obligation [member] | Not later than one year [member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities 77,183 110,062    
Financial obligation [member] | Later than one year and not later than two years [member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities 374,760 148,718    
Financial obligation [member] | Later ThanTwo Year And Not LaterThan Five Year Member [Member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities 201,487 449,689    
Financial obligation [member] | Later than five years [member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities 0 0    
Contingent consideration liability [member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities 38,376 37,749    
Contingent consideration liability [member] | Not later than one year [member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities 0 0    
Contingent consideration liability [member] | Later than one year and not later than two years [member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities 0 0    
Contingent consideration liability [member] | Later ThanTwo Year And Not LaterThan Five Year Member [Member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities 5,904 9,280    
Contingent consideration liability [member] | Later than five years [member]        
Disclosure of financial risk management objectives and policies [line items]        
Financial liabilities $ 32,472 $ 28,469