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Decommissioning provision (Schedule of Decomissioning Provision) (Details) - Decommissioning Provision [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of other provisions [line items]
Provisions, beginning of year	$ 3,829	$ 4,568
Decommissioning costs and change in estimates	(66)	(891)
Accretion on decommissioning provision	185	152
Provisions, end of year	$ 3,948	$ 3,829

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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.

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- Definition

The increase in existing other provisions. [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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- Definition

The amount reversed for unused other provisions. [Refer: Other provisions]

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