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Commitments and contingencies - Minimum purchase contract commitment (Details) - Take-or-pay purchase contracts $ in Thousands	Dec. 31, 2020 USD ($)
2021
Disclosure of contingent liabilities [line items]
Minimum estimated commitment	$ 397,515
2022
Disclosure of contingent liabilities [line items]
Minimum estimated commitment	397,346
2023
Disclosure of contingent liabilities [line items]
Minimum estimated commitment	431,060
2024
Disclosure of contingent liabilities [line items]
Minimum estimated commitment	447,165
2025
Disclosure of contingent liabilities [line items]
Minimum estimated commitment	447,017
Thereafter
Disclosure of contingent liabilities [line items]
Minimum estimated commitment	$ 1,560,734

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Definition

The amount of the estimated financial effect of contingent liabilities. [Refer: Contingent liabilities [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 37
-IssueDate 2020-01-01
-Paragraph 86
-Subparagraph a
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-URIDate 2020-01-01

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