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Financial instruments - Fair value measurement (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	$ 930,426,000	$ 745,572,000
Financial liabilities	2,121,467,000	2,074,083,000
Trade, other payables and accrued liabilities, excluding tax payable | Financial liabilities at amortised cost, category
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities	528,182,000	449,213,000
Long-term debt, including current portion | Financial liabilities at amortised cost, category
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities	1,502,271,000	1,556,206,000
Cash flow hedges | Derivative instruments | Financial liabilities at fair value through other comprehensive income, category
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities	91,014,000	68,664,000
Derivative instruments | Financial assets measured at fair value | Cash flow hedges
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	0	7,024,000
Cash and cash equivalents | Financial assets not measured at fair value
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	375,479,000	223,890,000
Trade and other receivables, excluding tax receivable | Financial assets not measured at fair value
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	527,084,000	479,272,000
Project financing reserve accounts included in other assets | Financial assets not measured at fair value
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	$ 27,863,000	$ 35,386,000

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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