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Financial Instruments - Movement in financial assets included in Level 3 of fair value hierarchy (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
IFRS Statement [Line Items]
Beginning balance	$ 488,013
Ending balance	463,195	$ 488,013
Level 3 [Member]
IFRS Statement [Line Items]
Beginning balance	10,559	3,122
Disposal-capital reduction of investment	(47)	(29)
Reclassified from equity method investments		6,136
Recognized in other comprehensive income	(35)	(702)
Recognized in profit or loss	3,732	2,032
Ending balance	14,209	10,559
Financial assets at fair value through profit or loss, category [member]
IFRS Statement [Line Items]
Recognized in profit or loss	3,732	2,032
Financial assets at fair value through profit or loss, category [member] | Level 3 [Member]
IFRS Statement [Line Items]
Beginning balance	9,768	1,600
Disposal-capital reduction of investment		0
Reclassified from equity method investments		6,136
Recognized in other comprehensive income		0
Recognized in profit or loss	3,732	2,032
Ending balance	13,500	9,768
Financial assets at fair value through other comprehensive income, category [member] | Level 3 [Member]
IFRS Statement [Line Items]
Beginning balance	791	1,522
Disposal-capital reduction of investment	(47)	(29)
Reclassified from equity method investments		0
Recognized in other comprehensive income	(35)	(702)
Recognized in profit or loss		0
Ending balance	$ 709	$ 791

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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