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Financial instruments (Details 28) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financial instruments [Line Items]    
Financial assets $ 291,790 $ 163,269
Financial liabilities 1,733,080 1,496,360
Other current financial liabilities [Member]    
Financial instruments [Line Items]    
Financial liabilities 23,585 220,328
Bank loans [Member]    
Financial instruments [Line Items]    
Financial liabilities 300 163,568
Derivative instruments [Member]    
Financial instruments [Line Items]    
Financial liabilities 2,855 5,979
Unsecured obligations [Member]    
Financial instruments [Line Items]    
Financial liabilities 15,145 13,494
Trade and other payables, current and non current [Member]    
Financial instruments [Line Items]    
Financial liabilities 163,751 196,280
Trade payables due to related parties, current [Member]    
Financial instruments [Line Items]    
Financial liabilities 9 1,365
Other non-current financial liabilities: [Member]    
Financial instruments [Line Items]    
Financial liabilities 1,330,382 1,031,507
Bank loans [Member]    
Financial instruments [Line Items]    
Financial liabilities 68,870 0
Unsecured obligations [Member]    
Financial instruments [Line Items]    
Financial liabilities 1,249,479 1,031,507
Non-current hedging liabilities [Member]    
Financial instruments [Line Items]    
Financial liabilities 12,033 0
Level 1 of fair value hierarchy [member] | Other current financial liabilities [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 1 of fair value hierarchy [member] | Bank loans [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 1 of fair value hierarchy [member] | Derivative instruments [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 1 of fair value hierarchy [member] | Forwards [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 1 of fair value hierarchy [member] | Options [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 1 of fair value hierarchy [member] | Hedging Swaps [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 1 of fair value hierarchy [member] | Unsecured obligations [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 1 of fair value hierarchy [member] | Trade and other payables, current and non current [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 1 of fair value hierarchy [member] | Trade payables due to related parties, current [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 1 of fair value hierarchy [member] | Other non-current financial liabilities: [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 1 of fair value hierarchy [member] | Bank loans [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 1 of fair value hierarchy [member] | Unsecured obligations [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 1 of fair value hierarchy [member] | Non-current hedging liabilities [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 2 of fair value hierarchy [member] | Other current financial liabilities [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 2 of fair value hierarchy [member] | Bank loans [Member]    
Financial instruments [Line Items]    
Financial liabilities 300 163,568
Level 2 of fair value hierarchy [member] | Derivative instruments [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 2 of fair value hierarchy [member] | Forwards [Member]    
Financial instruments [Line Items]    
Financial liabilities 2,723 5,534
Level 2 of fair value hierarchy [member] | Options [Member]    
Financial instruments [Line Items]    
Financial liabilities 132 445
Level 2 of fair value hierarchy [member] | Hedging Swaps [Member]    
Financial instruments [Line Items]    
Financial liabilities 5,285 37,287
Level 2 of fair value hierarchy [member] | Unsecured obligations [Member]    
Financial instruments [Line Items]    
Financial liabilities 15,145 13,494
Level 2 of fair value hierarchy [member] | Trade and other payables, current and non current [Member]    
Financial instruments [Line Items]    
Financial liabilities 163,751 196,280
Level 2 of fair value hierarchy [member] | Trade payables due to related parties, current [Member]    
Financial instruments [Line Items]    
Financial liabilities 9 1,365
Level 2 of fair value hierarchy [member] | Other non-current financial liabilities: [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 2 of fair value hierarchy [member] | Bank loans [Member]    
Financial instruments [Line Items]    
Financial liabilities 71,826 0
Level 2 of fair value hierarchy [member] | Unsecured obligations [Member]    
Financial instruments [Line Items]    
Financial liabilities 1,357,640 1,131,639
Level 2 of fair value hierarchy [member] | Non-current hedging liabilities [Member]    
Financial instruments [Line Items]    
Financial liabilities 12,033 0
Level 3 of fair value hierarchy [member] | Other current financial liabilities [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 3 of fair value hierarchy [member] | Bank loans [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 3 of fair value hierarchy [member] | Derivative instruments [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 3 of fair value hierarchy [member] | Forwards [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 3 of fair value hierarchy [member] | Options [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 3 of fair value hierarchy [member] | Hedging Swaps [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 3 of fair value hierarchy [member] | Unsecured obligations [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 3 of fair value hierarchy [member] | Trade and other payables, current and non current [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 3 of fair value hierarchy [member] | Trade payables due to related parties, current [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 3 of fair value hierarchy [member] | Other non-current financial liabilities: [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 3 of fair value hierarchy [member] | Bank loans [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 3 of fair value hierarchy [member] | Unsecured obligations [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Level 3 of fair value hierarchy [member] | Non-current hedging liabilities [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Fair value Informative [Member] | Other current financial liabilities [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Fair value Informative [Member] | Bank loans [Member]    
Financial instruments [Line Items]    
Financial liabilities 300 163,568
Fair value Informative [Member] | Derivative instruments [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Fair value Informative [Member] | Forwards [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Fair value Informative [Member] | Options [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Fair value Informative [Member] | Hedging Swaps [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Fair value Informative [Member] | Unsecured obligations [Member]    
Financial instruments [Line Items]    
Financial liabilities 15,145 13,494
Fair value Informative [Member] | Trade and other payables, current and non current [Member]    
Financial instruments [Line Items]    
Financial liabilities 163,751 196,280
Fair value Informative [Member] | Trade payables due to related parties, current [Member]    
Financial instruments [Line Items]    
Financial liabilities 9 1,365
Fair value Informative [Member] | Other non-current financial liabilities: [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Fair value Informative [Member] | Bank loans [Member]    
Financial instruments [Line Items]    
Financial liabilities 71,826 0
Fair value Informative [Member] | Unsecured obligations [Member]    
Financial instruments [Line Items]    
Financial liabilities 1,357,640 1,131,639
Fair value Informative [Member] | Non-current hedging liabilities [Member]    
Financial instruments [Line Items]    
Financial liabilities 0  
Fair Value [Member] | Other current financial liabilities [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Fair Value [Member] | Bank loans [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Fair Value [Member] | Derivative instruments [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Fair Value [Member] | Forwards [Member]    
Financial instruments [Line Items]    
Financial liabilities 2,723 5,534
Fair Value [Member] | Options [Member]    
Financial instruments [Line Items]    
Financial liabilities 132 445
Fair Value [Member] | Hedging Swaps [Member]    
Financial instruments [Line Items]    
Financial liabilities 5,285 37,287
Fair Value [Member] | Unsecured obligations [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Fair Value [Member] | Trade and other payables, current and non current [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Fair Value [Member] | Trade payables due to related parties, current [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Fair Value [Member] | Other non-current financial liabilities: [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Fair Value [Member] | Bank loans [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Fair Value [Member] | Unsecured obligations [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Fair Value [Member] | Non-current hedging liabilities [Member]    
Financial instruments [Line Items]    
Financial liabilities 12,033 0
Gross carrying amount [member]    
Financial instruments [Line Items]    
Financial liabilities 1,492,890 1,247,640
Gross carrying amount [member] | Other current financial liabilities [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Gross carrying amount [member] | Bank loans [Member]    
Financial instruments [Line Items]    
Financial liabilities 300 163,568
Gross carrying amount [member] | Derivative instruments [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Gross carrying amount [member] | Forwards [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Gross carrying amount [member] | Options [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Gross carrying amount [member] | Hedging Swaps [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Gross carrying amount [member] | Unsecured obligations [Member]    
Financial instruments [Line Items]    
Financial liabilities 15,145 13,494
Gross carrying amount [member] | Trade and other payables, current and non current [Member]    
Financial instruments [Line Items]    
Financial liabilities 163,751 196,280
Gross carrying amount [member] | Trade payables due to related parties, current [Member]    
Financial instruments [Line Items]    
Financial liabilities 9 1,365
Gross carrying amount [member] | Other non-current financial liabilities: [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Gross carrying amount [member] | Bank loans [Member]    
Financial instruments [Line Items]    
Financial liabilities 68,870 0
Gross carrying amount [member] | Unsecured obligations [Member]    
Financial instruments [Line Items]    
Financial liabilities 1,249,479 1,031,507
Gross carrying amount [member] | Non-current hedging liabilities [Member]    
Financial instruments [Line Items]    
Financial liabilities 0 0
Cash and cash equivalents [Member]    
Financial instruments [Line Items]    
Financial assets 556,066 630,438
Cash and cash equivalents [Member] | Level 1 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Cash and cash equivalents [Member] | Level 2 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 556,066 630,438
Cash and cash equivalents [Member] | Level 3 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Cash and cash equivalents [Member] | Fair value Informative [Member]    
Financial instruments [Line Items]    
Financial assets 556,066 630,438
Cash and cash equivalents [Member] | Fair Value [Member]    
Financial instruments [Line Items]    
Financial assets 0 0
Cash and cash equivalents [Member] | Gross carrying amount [member]    
Financial instruments [Line Items]    
Financial assets 556,066 630,438
Trade and other receivables, current [Member}    
Financial instruments [Line Items]    
Financial assets 464,855 446,875
Trade and other receivables, current [Member} | Level 1 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Trade and other receivables, current [Member} | Level 2 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 464,855 446,875
Trade and other receivables, current [Member} | Level 3 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Trade and other receivables, current [Member} | Fair value Informative [Member]    
Financial instruments [Line Items]    
Financial assets 464,855 446,875
Trade and other receivables, current [Member} | Fair Value [Member]    
Financial instruments [Line Items]    
Financial assets 0 0
Trade and other receivables, current [Member} | Gross carrying amount [member]    
Financial instruments [Line Items]    
Financial assets 464,855 446,875
Receivables due from related parties, current [Member]    
Financial instruments [Line Items]    
Financial assets 44,554 59,132
Receivables due from related parties, current [Member] | Level 1 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Receivables due from related parties, current [Member] | Level 2 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 44,554 59,132
Receivables due from related parties, current [Member] | Level 3 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Receivables due from related parties, current [Member] | Fair value Informative [Member]    
Financial instruments [Line Items]    
Financial assets 44,554 59,132
Receivables due from related parties, current [Member] | Fair Value [Member]    
Financial instruments [Line Items]    
Financial assets 0 0
Receivables due from related parties, current [Member] | Gross carrying amount [member]    
Financial instruments [Line Items]    
Financial assets 44,554 59,132
Other current financial assets: [Member]    
Financial instruments [Line Items]    
Financial assets 312,721 366,979
Other current financial assets: [Member] | Level 1 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Other current financial assets: [Member] | Level 2 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Other current financial assets: [Member] | Level 3 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Other current financial assets: [Member] | Fair value Informative [Member]    
Financial instruments [Line Items]    
Financial assets 0 0
Other current financial assets: [Member] | Fair Value [Member]    
Financial instruments [Line Items]    
Financial assets 0 0
Other current financial assets: [Member] | Gross carrying amount [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Time deposits [Member]    
Financial instruments [Line Items]    
Financial assets 291,790 360,941
Time deposits [Member] | Level 1 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Time deposits [Member] | Level 2 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 291,790 360,941
Time deposits [Member] | Level 3 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Time deposits [Member] | Fair value Informative [Member]    
Financial instruments [Line Items]    
Financial assets 291,790 360,941
Time deposits [Member] | Fair Value [Member]    
Financial instruments [Line Items]    
Financial assets 0 0
Time deposits [Member] | Gross carrying amount [member]    
Financial instruments [Line Items]    
Financial assets 291,790 360,941
Derivative instruments [Member]    
Financial instruments [Line Items]    
Financial assets 2,693 6,038
Derivative instruments [Member] | Level 1 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Derivative instruments [Member] | Level 2 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Derivative instruments [Member] | Level 3 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Derivative instruments [Member] | Fair value Informative [Member]    
Financial instruments [Line Items]    
Financial assets 0 0
Derivative instruments [Member] | Fair Value [Member]    
Financial instruments [Line Items]    
Financial assets 0 0
Derivative instruments [Member] | Gross carrying amount [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Forwards [Member] | Level 1 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Forwards [Member] | Level 2 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 2,637 2,744
Forwards [Member] | Level 3 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Forwards [Member] | Fair value Informative [Member]    
Financial instruments [Line Items]    
Financial assets 0 0
Forwards [Member] | Fair Value [Member]    
Financial instruments [Line Items]    
Financial assets 2,637 2,744
Forwards [Member] | Gross carrying amount [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Options [Member] | Level 1 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Options [Member] | Level 2 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 56 110
Options [Member] | Level 3 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Options [Member] | Fair value Informative [Member]    
Financial instruments [Line Items]    
Financial assets 0 0
Options [Member] | Fair Value [Member]    
Financial instruments [Line Items]    
Financial assets 56 110
Options [Member] | Gross carrying amount [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Hedging assets [Member]    
Financial instruments [Line Items]    
Financial assets 18,238 0
Hedging assets [Member] | Level 1 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Hedging assets [Member] | Level 2 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 3,184
Hedging assets [Member] | Level 3 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Hedging assets [Member] | Fair value Informative [Member]    
Financial instruments [Line Items]    
Financial assets 0 0
Hedging assets [Member] | Fair Value [Member]    
Financial instruments [Line Items]    
Financial assets 0 3,184
Hedging assets [Member] | Gross carrying amount [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Investment Hedge Swaps [Member] | Level 1 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets   0
Financial liabilities 0  
Investment Hedge Swaps [Member] | Level 2 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets   0
Financial liabilities 18,238  
Investment Hedge Swaps [Member] | Level 3 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets   0
Financial liabilities 0  
Investment Hedge Swaps [Member] | Fair value Informative [Member]    
Financial instruments [Line Items]    
Financial assets   0
Financial liabilities 0  
Investment Hedge Swaps [Member] | Fair Value [Member]    
Financial instruments [Line Items]    
Financial assets   0
Financial liabilities 18,238  
Investment Hedge Swaps [Member] | Gross carrying amount [member]    
Financial instruments [Line Items]    
Financial assets   0
Financial liabilities 0  
Non-current accounts receivable [Member]    
Financial instruments [Line Items]    
Financial assets 424 1,912
Non-current accounts receivable [Member] | Level 1 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Non-current accounts receivable [Member] | Level 2 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 1,912
Non-current accounts receivable [Member] | Level 3 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Non-current accounts receivable [Member] | Fair value Informative [Member]    
Financial instruments [Line Items]    
Financial assets 424 1,912
Non-current accounts receivable [Member] | Fair Value [Member]    
Financial instruments [Line Items]    
Financial assets 0 0
Non-current accounts receivable [Member] | Gross carrying amount [member]    
Financial instruments [Line Items]    
Financial assets 424 1,912
Other non-current financial assets: [Member]    
Financial instruments [Line Items]    
Financial assets 17,131 42,879
Other non-current financial assets: [Member] | Level 1 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Other non-current financial assets: [Member] | Level 2 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Other non-current financial assets: [Member] | Level 3 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Other non-current financial assets: [Member] | Fair value Informative [Member]    
Financial instruments [Line Items]    
Financial assets 0 0
Other non-current financial assets: [Member] | Fair Value [Member]    
Financial instruments [Line Items]    
Financial assets 0 0
Other non-current financial assets: [Member] | Gross carrying amount [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Others [Member] | Level 1 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Others [Member] | Level 2 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 95 24,811
Others [Member] | Level 3 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Others [Member] | Fair value Informative [Member]    
Financial instruments [Line Items]    
Financial assets 95 24,811
Others [Member] | Fair Value [Member]    
Financial instruments [Line Items]    
Financial assets 0 0
Others [Member] | Gross carrying amount [member]    
Financial instruments [Line Items]    
Financial assets 95 24,811
Actions [Member] | Level 1 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets   9,159
Financial liabilities 0  
Actions [Member] | Level 2 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets   0
Financial liabilities 0  
Actions [Member] | Level 3 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets   0
Financial liabilities 0  
Actions [Member] | Fair value Informative [Member]    
Financial instruments [Line Items]    
Financial assets   0
Financial liabilities 0  
Actions [Member] | Fair Value [Member]    
Financial instruments [Line Items]    
Financial assets   9,159
Financial liabilities 3,611  
Actions [Member] | Gross carrying amount [member]    
Financial instruments [Line Items]    
Financial assets   0
Financial liabilities 0  
Hedging Swaps [Member] | Level 1 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Hedging Swaps [Member] | Level 2 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 13,425 8,909
Hedging Swaps [Member] | Level 3 of fair value hierarchy [member]    
Financial instruments [Line Items]    
Financial assets 0 0
Hedging Swaps [Member] | Fair value Informative [Member]    
Financial instruments [Line Items]    
Financial assets 0 0
Hedging Swaps [Member] | Fair Value [Member]    
Financial instruments [Line Items]    
Financial assets 13,425 8,909
Hedging Swaps [Member] | Gross carrying amount [member]    
Financial instruments [Line Items]    
Financial assets $ 0 $ 0