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Other long-term liabilities - Other long-term liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Subclassifications of assets, liabilities and equities [abstract]
Site restoration costs	$ 31,092	$ 27,638
Share-based compensation liability	18,382	52,794
Cash flow hedges	195,124	105,721
Defined benefit pension plans	28,121	24,783
Land mortgage	29,849	30,242
Government grant construction obligation	3,173	0
Other	6,582	3,306
Other long-term liabilities, total	312,323	244,484
Less current maturities	(26,252)	(36,914)
Other non-current liabilities	$ 286,071	$ 207,570

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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 assistance by government in the form of transfers of resources to an entity in return for past or future compliance with certain conditions relating to the operating activities of the entity, recognised as deferred income. They exclude those forms of government assistance that cannot reasonably have a value placed upon them and transactions with government that cannot be distinguished from the normal trading transactions of the entity. [Refer: Government [member]]

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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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