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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, 2017	Dec. 31, 2016
Reconciliation of changes in other provisions [abstract]
Balance at beginning of period	$ 30,512	$ 29,892
New or revised provisions	2,823	51
Accretion expense	640	569
Balance at end of period	$ 33,975	$ 30,512

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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