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Financial Risk Management - Changes in Level 3 Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Statement Line Items [Line Items]
At the beginning of the year	$ 14,251,299	$ 14,398,218
At the end of the year	14,842,991	14,251,299
Level 3 of fair value hierarchy [member]
Statement Line Items [Line Items]
At the beginning of the year	52,985	26,409
Addition / (Decrease)	2,933	26,768
Currency translation adjustment and others	(337)	(192)
At the end of the year	$ 55,581	$ 52,985

Expiry date 2020-01-01: The amount of resources: (a) controlled by the entity as a result of past events; and (b) from which future economic benefits are expected to flow to the entity. Effective 2020-01-01: The amount of a present economic resource controlled by the entity as a result of past events. Economic resource is a right that has the potential to produce economic benefits.

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