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Disclosure of information on segments - Reconciliation of segment liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of information on segments [Line Items]
Total liability	$ 1,139,074	$ 1,187,656	$ 1,269,186
Operating Segments [Member]
Disclosure of information on segments [Line Items]
Total liability	5,612,754	5,248,748	5,315,362
Elimination of liabilities of equity accounted investees [Member]
Disclosure of information on segments [Line Items]
Total liability	(4,423,274)	(4,034,896)	(4,012,805)
Elimination of intercompany payables [Member]
Disclosure of information on segments [Line Items]
Total liability	(50,395)	(27,822)	(32,769)
Elimination of intersegment other liabilities amount [Member]
Disclosure of information on segments [Line Items]
Total liability	$ (11)	$ 1,626	$ (602)

Expiry date 2020-01-01: The amount of present obligations of the entity arising from past events, the settlement of which is expected to result in an outflow from the entity of resources embodying economic benefits. Effective 2020-01-01: The amount of a present obligation of the entity to transfer an economic resource as a result of past events. Economic resource is a right that has the potential to produce economic benefits.

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