Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Variable interest entities (Maximum exposure to loss in VIEs) (Details)

v3.8.0.1
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