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Variable interest entities (Maximum exposure to loss in VIEs) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Variable Interest Entities [Abstract]    
Carrying value of investments (Note 11) $ 122,946 $ 118,783
Debt guarantees 104,867 125,429
Maximum exposure to loss $ 227,813 $ 244,212