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- Other long-term liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract]
Site restoration costs	$ 27,638	$ 33,975
Finance lease obligations	198,374	204,242
Share-based compensation liability (note 13)	52,794	111,405
Cash flow hedges (note 18)	105,721	90,199
Defined benefit pension plans (note 20)	24,783	25,076
Land mortgage	30,242	0
Other	4,692	5,214
Other long-term liabilities, total	444,244	470,111
Less current maturities	(46,146)	(65,226)
Other non-current liabilities	$ 398,098	$ 404,885

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The amount of instruments issued by the entity that represent indebtedness.

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The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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The amount of liabilities related to finance leases.

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The amount of liabilities arising from share-based payment transactions. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Share-based payment arrangements [member]]

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The amount of current liabilities that the entity does not separately disclose in the same statement or note. [Refer: Current liabilities]

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The amount of non-current liabilities that the entity does not separately disclose in the same statement or note. [Refer: Non-current liabilities]

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The amount of provision for costs related to decommissioning, restoration and rehabilitation. [Refer: Other provisions]

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The amount of provisions for employee benefits. [Refer: Employee benefits expense; Provisions]

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