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Other long-term liabilities - Provision for site restoration costs (Details) - Provision for site restoration costs - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of changes in other provisions [abstract]
Balance at beginning of period	$ 31,092	$ 27,638
New or revised provisions	423	2,638
Accretion expense	426	816
Balance at end of period	$ 31,941	$ 31,092

X

- Definition

The amount of additional other provisions made. [Refer: Other provisions]

+ References

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-IssueDate 2020-01-01
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X

- Definition

The increase in other provisions through adjustments arising from the passage of time. [Refer: Other provisions]

+ References

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- Definition

The amount of provisions other than provisions for employee benefits. [Refer: Provisions]

+ References

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