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Basis of presentation for the consolidated financial statements (Details 1) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Categories of current financial assets [abstract]        
Current financial assets at amortised cost $ 1,357,265,000 $ 1,497,386,000    
Financial assets at fair value through profit or loss, classified as held for trading 37,987,000 48,872,000    
Categories of non-current financial assets [abstract]        
Non-current financial assets at amortised cost 2,350,000 1,957,000    
Adjustments Through IFRS 2,301,000      
Categories of current financial liabilities [abstract]        
Current financial liabilities at fair value through profit or loss 179,205,000 374,707    
Categories of non-current financial liabilities [abstract]        
Non-current financial liabilities   1,031,507,000    
Equity [Abstract]        
Equity 2,137,802,000 2,247,468,000 $ 2,307,272,000 $ 2,400,356,000
Financial assets at fair value through profit or loss, category [member]        
Categories of current financial liabilities [abstract]        
Current financial liabilities at fair value through profit or loss 5,979,000 5,979,000    
Accounts Payable To Related Parties [Member]        
Categories of current financial liabilities [abstract]        
Current financial liabilities at amortised cost 1,365,000 1,365,000    
Hedging liabilities [Member]        
Categories of current financial liabilities [abstract]        
Current financial liabilities at amortised cost 5,285,000 37,287,000    
Current Financial Liabilities at Fair Value through Other comprehensive income 37,287,000 37,287,000    
Categories of non-current financial liabilities [abstract]        
Non-current financial liabilities at amortised cost   0    
Bank borrowings [Member]        
Categories of current financial liabilities [abstract]        
Current financial liabilities at fair value through profit or loss 300,000 163,568,000    
Current financial liabilities at amortised cost 163,568,000 163,568,000    
Obligations To Public [Member]        
Categories of current financial liabilities [abstract]        
Current financial liabilities at amortised cost 13,494,000 13,494,000    
Categories of non-current financial liabilities [abstract]        
Non-current financial liabilities at amortised cost 1,031,507,000 1,031,507,000    
Trade And Other Payable [Member]        
Categories of current financial liabilities [abstract]        
Current financial liabilities at amortised cost 196,280,000 196,280,000    
Categories of non-current financial liabilities [abstract]        
Non-current financial liabilities at amortised cost 0 0    
Deferred Tax Liabilities [Member]        
Categories of non-current financial liabilities [abstract]        
Non-current financial liabilities 205,283,000 205,904,000    
Cash and Cash Equivalents [Member]        
Categories of current financial assets [abstract]        
Current financial assets at amortised cost 630,438,000 630,438,000    
Receivables due from related parties [Member]        
Categories of current financial assets [abstract]        
Current financial assets at amortised cost 59,132,000 59,132,000    
Term deposits [Member]        
Categories of current financial assets [abstract]        
Current financial assets at amortised cost 360,941,000 360,941,000    
Financial assets at fair value through profit or loss, category [member]        
Categories of current financial assets [abstract]        
Financial assets at fair value through profit or loss, classified as held for trading 6,038,000 6,038,000    
Categories of non-current financial assets [abstract]        
Derivatives for hedging purposes 8,910,000 8,910,000    
Financial assets classified as available for sale at fair value through equity 33,924,000 33,924,000    
Loans and receivables, category [member]        
Categories of current financial assets [abstract]        
Current financial assets at amortised cost 444,574,000 446,875,000    
Categories of non-current financial assets [abstract]        
Non-current financial assets at amortised cost 1,912,000 1,912,000    
Financial assets at amortised cost, category [member]        
Categories of non-current financial assets [abstract]        
Non-current financial assets at amortised cost 45,000 $ 45,000    
Aggregate adjustment to carrying amounts reported under previous GAAP [member]        
Categories of non-current financial assets [abstract]        
Adjustments Through IFRS (2,301,000)      
Equity [Abstract]        
Equity (1,680,000)      
Aggregate adjustment to carrying amounts reported under previous GAAP [member] | Deferred Tax Liabilities [Member]        
Categories of non-current financial liabilities [abstract]        
Non-current financial liabilities (621,000)      
Aggregate adjustment to carrying amounts reported under previous GAAP [member] | Cash and Cash Equivalents [Member]        
Categories of current financial assets [abstract]        
Current financial assets at amortised cost 0      
Aggregate adjustment to carrying amounts reported under previous GAAP [member] | Receivables due from related parties [Member]        
Categories of current financial assets [abstract]        
Current financial assets at amortised cost 0      
Aggregate adjustment to carrying amounts reported under previous GAAP [member] | Term deposits [Member]        
Categories of current financial assets [abstract]        
Current financial assets at amortised cost 0      
Aggregate adjustment to carrying amounts reported under previous GAAP [member] | Financial assets at fair value through profit or loss, category [member]        
Categories of current financial assets [abstract]        
Financial assets at fair value through profit or loss, classified as held for trading 0      
Categories of non-current financial assets [abstract]        
Derivatives for hedging purposes 0      
Financial assets classified as available for sale at fair value through equity 0      
Aggregate adjustment to carrying amounts reported under previous GAAP [member] | Loans and receivables, category [member]        
Categories of current financial assets [abstract]        
Current financial assets at amortised cost (2,301,000)      
Categories of non-current financial assets [abstract]        
Non-current financial assets at amortised cost 0      
Aggregate adjustment to carrying amounts reported under previous GAAP [member] | Financial assets at amortised cost, category [member]        
Categories of non-current financial assets [abstract]        
Non-current financial assets at amortised cost $ 0