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Financial instruments (Details 30) - 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
Bank loans [Member]
Financial instruments [Line Items]
Financial liabilities	300	163,568
Financial liabilities, at fair value	300	163,568
Derivative instruments [Member]
Financial instruments [Line Items]
Financial liabilities	2,855	5,979
Financial liabilities, at fair value	2,855	5,979
Hedging liabilities [Member]
Financial instruments [Line Items]
Financial liabilities	5,285	37,287
Financial liabilities, at fair value	5,285	37,287
Other financial liabilities, current [Member]
Financial instruments [Line Items]
Financial liabilities	23,585	220,328
Financial liabilities, at fair value	23,585	220,328
Current and non-current accounts payable [Member]
Financial instruments [Line Items]
Financial liabilities	163,751	196,280
Financial liabilities, at fair value	163,751	196,280
Payables due to related parties, non-current [Member]
Financial instruments [Line Items]
Financial liabilities	9	1,365
Financial liabilities, at fair value	9	1,365
Bank loans [Member]
Financial instruments [Line Items]
Financial liabilities	68,870	0
Financial liabilities, at fair value	71,826	0
Unsecured obligations [Member]
Financial instruments [Line Items]
Financial liabilities	1,249,479	1,031,507
Financial liabilities, at fair value	1,404,614	1,131,639
Non-current hedging liabilities [Member]
Financial instruments [Line Items]
Financial liabilities	12,033	0
Financial liabilities, at fair value	2,657	0
Other non-current financial liabilities: [Member]
Financial instruments [Line Items]
Financial liabilities	1,330,382	1,031,507
Financial liabilities, at fair value	1,479,097	1,131,639
Unsecured obligations [Member]
Financial instruments [Line Items]
Financial liabilities	15,145	13,494
Financial liabilities, at fair value	15,145	13,494
Cash and cash equivalents [Member]
Financial instruments [Line Items]
Financial assets	556,066	630,438
Financial assets, at fair value	556,066	630,438
Current trade and other receivables [Member]
Financial instruments [Line Items]
Financial assets	464,855	446,875
Financial assets, at fair value	464,855	446,875
Receivables due from related parties, current [Member]
Financial instruments [Line Items]
Financial assets	44,554	59,132
Financial assets, at fair value	44,554	59,132
Time deposits [Member]
Financial instruments [Line Items]
Financial assets	291,790	360,941
Financial assets, at fair value	291,790	360,941
Derivative instruments [Member]
Financial instruments [Line Items]
Financial assets	2,693	6,038
Financial assets, at fair value	2,693	6,038
Hedging assets [Member]
Financial instruments [Line Items]
Financial assets	18,238	0
Financial assets, at fair value	18,238	0
Total other current financial assets [Member]
Financial instruments [Line Items]
Financial assets	312,721	366,979
Financial assets, at fair value	312,721	366,979
Non-Current Trade Receivables [Member]
Financial instruments [Line Items]
Financial assets	424	1,912
Financial assets, at fair value	424	1,912
Other non-current financial assets: [Member]
Financial instruments [Line Items]
Financial assets	17,131	42,879
Financial assets, at fair value	17,131	42,879
Total other non-current financial assets: [Member]
Financial instruments [Line Items]
Financial assets	17,131	42,879
Financial assets, at fair value	$ 17,131	$ 42,879

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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