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Variable interest entities (Maximum exposure to loss in VIEs) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Variable Interest Entities [Abstract]    
Carrying value of debt and equity investments $ 126,920 $ 123,279
Debt guarantees 8,848 68,901
Maximum exposure to loss $ 135,768 $ 192,180