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Disclosure of information on segments - Reconciliation of segment assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of information on segments [Line Items]      
Assets $ 3,979,617 $ 4,107,274 $ 4,217,221
Elimination Of assets Of Equity Accounted Investees, Not Consolidated (10,564,402) (10,501,411) (9,963,853)
Elimination of the Subsidiaries And Associates of The Parent Company (1,005,368) (1,111,454) (1,184,240)
Elimination of Segment Assets Intercompany Receivables (57,810) (64,708) (32,444)
Elimination of Other Segment Assets 17,486 23,210 28,234
Operating Segments [Member]      
Disclosure of information on segments [Line Items]      
Assets $ 15,589,711 $ 15,761,637 $ 15,369,524