Revenue and expenses (Narrative) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2020 USD ($) Share	Dec. 31, 2019 USD ($) Share
Revenue And Expenses [Line Items]
Variable consideration adjustment	$ 6,668	$ (16,295)
Stock options granted \| Share	1,581,385	0
Impairment loss recognised in profit or loss, property, plant and equipment		$ 322,249
Employee share purchase plan, matching contribution, percentage	75.00%	75.00%
Bottom of range [member]
Revenue And Expenses [Line Items]
Employee share purchase plan, contributions, percentage of pre-tax base salary	1.00%	1.00%
Top of range [member]
Revenue And Expenses [Line Items]
Employee share purchase plan, contributions, percentage of pre-tax base salary	10.00%	10.00%
Manitoba [Member]
Revenue And Expenses [Line Items]
Profit sharing plan, percentage	10.00%	10.00%
Peru [Member]
Revenue And Expenses [Line Items]
Profit sharing plan, percentage	8.00%	8.00%

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Employee share purchase plan, matching contribution, percentage

+ References

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- Definition

Profit sharing plan, percentage

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- Definition

The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The increase (decrease) in contract liabilities resulting from cumulative catch-up adjustments to revenue arising from a contract modification. A contract modification is a change in the scope or price (or both) of a contract that is approved by the parties to the contract. [Refer: Increase (decrease) through cumulative catch-up adjustments to revenue, contract liabilities]

+ References

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- Definition

The number of share options granted in a share-based payment arrangement.

+ References

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