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Financial instruments (Details 30) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Financial instruments [Line Items]
Financial assets	$ 485,689,000	$ 1,397,602,000
Financial liabilities	1,518,926,000	1,517,727,000
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
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 assets	4,785
Financial liabilities		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] | Bank loans [Member]
Financial instruments [Line Items]
Financial liabilities		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] | Bank loans [Member]
Financial instruments [Line Items]
Financial liabilities	199,000	300,000
Level 2 of fair value hierarchy [member] | Derivative instruments [Member]
Financial instruments [Line Items]
Financial liabilities	0
Level 2 of fair value hierarchy [member] | Forwards [Member]
Financial instruments [Line Items]
Financial liabilities	2,837,000	2,723,000
Level 2 of fair value hierarchy [member] | Options [Member]
Financial instruments [Line Items]
Financial assets	0
Financial liabilities	289,000	132,000
Level 2 of fair value hierarchy [member] | Hedging Swaps [Member]
Financial instruments [Line Items]
Financial liabilities	7,183,000	5,285,000
Level 2 of fair value hierarchy [member] | Unsecured obligations [Member]
Financial instruments [Line Items]
Financial liabilities	280,578,000	15,145,000
Level 2 of fair value hierarchy [member] | Bank loans [Member]
Financial instruments [Line Items]
Financial liabilities	71,033,000	71,826,000
Level 2 of fair value hierarchy [member] | Unsecured obligations [Member]
Financial instruments [Line Items]
Financial liabilities	1,658,506,000	1,357,640,000
Level 2 of fair value hierarchy [member] | Non-current hedging liabilities [Member]
Financial instruments [Line Items]
Financial liabilities	16,477,000	12,033,000
Level 2 of fair value hierarchy [member] | Current Lease Liabilities [Member]
Financial instruments [Line Items]
Financial liabilities	7,694,000
Level 2 of fair value hierarchy [member] | Noncurrent Lease Liabilities [Member]
Financial instruments [Line Items]
Financial liabilities	33,187,000
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
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 assets	0
Financial liabilities		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] | 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] | Bank loans [Member]
Financial instruments [Line Items]
Financial liabilities	199,000	300,000
Fair value Informative [Member] | Derivative instruments [Member]
Financial instruments [Line Items]
Financial liabilities	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 assets	0
Financial liabilities		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	280,578,000	15,145,000
Fair value Informative [Member] | Bank loans [Member]
Financial instruments [Line Items]
Financial liabilities	71,033,000	71,826,000
Fair value Informative [Member] | Unsecured obligations [Member]
Financial instruments [Line Items]
Financial liabilities	1,658,506,000	1,357,640,000
Fair value Informative [Member] | Non-current hedging liabilities [Member]
Financial instruments [Line Items]
Financial liabilities	0	0
Fair value Informative [Member] | Current Lease Liabilities [Member]
Financial instruments [Line Items]
Financial liabilities	7,694,000
Fair value Informative [Member] | Noncurrent Lease Liabilities [Member]
Financial instruments [Line Items]
Financial liabilities	33,187,000
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
Fair Value [Member] | Forwards [Member]
Financial instruments [Line Items]
Financial liabilities	2,837,000	2,723,000
Fair Value [Member] | Options [Member]
Financial instruments [Line Items]
Financial assets	4,785
Financial liabilities	289,000	132,000
Fair Value [Member] | Hedging Swaps [Member]
Financial instruments [Line Items]
Financial liabilities	7,183,000	5,285,000
Fair Value [Member] | Unsecured obligations [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	16,477,000	12,033,000
Gross carrying amount [member]
Financial instruments [Line Items]
Financial liabilities	2,042,462,000	1,527,250,000
Gross carrying amount [member] | Bank loans [Member]
Financial instruments [Line Items]
Financial liabilities	199,000	300,000
Gross carrying amount [member] | Derivative instruments [Member]
Financial instruments [Line Items]
Financial liabilities	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 assets	0
Financial liabilities		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	280,578,000	15,145,000
Gross carrying amount [member] | Bank loans [Member]
Financial instruments [Line Items]
Financial liabilities	69,138,000	68,870,000
Gross carrying amount [member] | Unsecured obligations [Member]
Financial instruments [Line Items]
Financial liabilities	1,403,108,000	1,249,479,000
Gross carrying amount [member] | Non-current hedging liabilities [Member]
Financial instruments [Line Items]
Financial liabilities	0	0
Gross carrying amount [member] | Current Lease Liabilities [Member]
Financial instruments [Line Items]
Financial liabilities	7,694,000
Gross carrying amount [member] | Noncurrent Lease Liabilities [Member]
Financial instruments [Line Items]
Financial liabilities	30,203,000
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	588,530,000	556,066,000
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	588,530,000	556,066,000
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	588,530,000	556,066,000
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	485,689,000	291,790,000
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	485,689,000	291,790,000
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	485,689,000	291,790,000
Derivative instruments [Member] | Level 1 of fair value hierarchy [member]
Financial instruments [Line Items]
Financial assets	0
Derivative instruments [Member] | Level 2 of fair value hierarchy [member]
Financial instruments [Line Items]
Financial assets	0
Derivative instruments [Member] | Level 3 of fair value hierarchy [member]
Financial instruments [Line Items]
Financial assets	0
Derivative instruments [Member] | Fair value Informative [Member]
Financial instruments [Line Items]
Financial assets	0
Derivative instruments [Member] | Fair Value [Member]
Financial instruments [Line Items]
Financial assets	0
Derivative instruments [Member] | Gross carrying amount [member]
Financial instruments [Line Items]
Financial assets	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	2,420,000	2,637,000
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	2,420,000	2,637,000
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	111,000	56,000
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	111,000	56,000
Options [Member] | Gross carrying amount [member]
Financial instruments [Line Items]
Financial assets	0	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	0
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	0
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 liabilities	0	0
Investment Hedge Swaps [Member] | Level 2 of fair value hierarchy [member]
Financial instruments [Line Items]
Financial liabilities	17,270,000	18,238,000
Investment Hedge Swaps [Member] | Level 3 of fair value hierarchy [member]
Financial instruments [Line Items]
Financial liabilities	0	0
Investment Hedge Swaps [Member] | Fair value Informative [Member]
Financial instruments [Line Items]
Financial liabilities	0	0
Investment Hedge Swaps [Member] | Fair Value [Member]
Financial instruments [Line Items]
Financial liabilities	17,270,000	18,238,000
Investment Hedge Swaps [Member] | Gross carrying amount [member]
Financial instruments [Line Items]
Financial liabilities	0	0
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	0
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	1,710,000	2,275,000
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	1,710,000	2,275,000
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	94,000	75,000
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	94,000	75,000
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	94,000	75,000
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	3,918,000	13,425,000
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	3,918,000	13,425,000
Hedging Swaps [Member] | Gross carrying amount [member]
Financial instruments [Line Items]
Financial assets	$ 0	$ 0

X

- Definition

The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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X

- Definition

The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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