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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, 2019	Dec. 31, 2018
Reconciliation of changes in other provisions [abstract]
Balance at beginning of period	$ 27,638	$ 33,975
New or revised provisions	2,638	(7,036)
Accretion expense	816	699
Balance at end of period	$ 31,092	$ 27,638

X

- Definition

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

+ References

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- 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]

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