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Variable interest entities (Maximum exposure to loss in VIEs) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Variable Interest Entities [Abstract]    
Carrying value of debt and equity investments $ 135,748 $ 132,113
Debt guarantees 80,366 88,313
Maximum exposure to loss $ 216,114 $ 220,426