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PROVISIONS - Changes in the Close Down and Restoration Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of changes in other provisions [abstract]
Balance, beginning of year	$ 62,172	$ 58,330	$ 63,909
Settled during the year	(852)	(926)
Accretion expense	3,459	3,380
Foreign exchange gain (loss)	(504)	396
Revisions and new estimated cash flows	1,739	(8,429)
Less: current portion	(211)	(978)
Non-current close down and restoration provision	$ 61,961	$ 57,352

X

- Definition

The increase (decrease) in other provisions resulting from foreign currency exchange rate changes on provisions measured in a currency different from the entity's presentation currency. [Refer: Other provisions]

+ References

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The amount of non-current provision for decommissioning, restoration and rehabilitation costs. [Refer: Provision for decommissioning, restoration and rehabilitation costs]

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The amount recognised for new other provisions. [Refer: Other provisions]

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The amount of provision for costs related to decommissioning, restoration and rehabilitation. [Refer: Other provisions]

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The amount used (ie incurrent and charged against the provision) for other provisions. [Refer: Other provisions]

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The amount of current provision for decommissioning, restoration and rehabilitation costs. [Refer: Provision for decommissioning, restoration and rehabilitation costs]

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Increase (decrease) in accretion expense, other provisions

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