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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 |  |  |

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