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HOT MADEN INTEREST (Summarized Financial Information in Associate Carrying Amount Rollforward) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of associates [line items]
Currency translation adjustments	$ (15,205)	$ 121
At December 31, 2017	177,452
Hot Maden Associate [member]
Disclosure of associates [line items]
At January 1, 2017
Acquisition of Investment in Associate (note 7)	190,714
Company's share of net income (loss) of associate	(28)
Capital Investment	584
Currency translation adjustments	(13,818)
At December 31, 2017	$ 177,452

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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.

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- Definition

The gains (losses) recognised in other comprehensive income on exchange differences on the translation of financial statements of foreign operations, net of tax. [Refer: Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of investments in associates accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Addition to investments in associates accounted for using equity method.

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Capital invested in associate.

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- Definition

The entity's share of the profit (loss) from continuing operations of associates accounted for using the equity method, increase (decrease) to carrying amount.

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