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Variable interest entities (Maximum exposure to loss in VIEs) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Variable Interest Entities [Abstract]    
Carrying value of debt and equity investments $ 132,113 $ 122,946
Debt guarantees 88,313 104,867
Maximum exposure to loss $ 220,426 $ 227,813