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Variable interest entities (Tables)
12 Months Ended
Dec. 31, 2017
Variable Interest Entities [Abstract]  
Schedule of maximum exposure to loss in VIEs
The following table presents our maximum exposure to loss in non-consolidated VIEs as of December 31, 2017 and 2016:
 
As of December 31,
 
2017
 
2016
Carrying value of investments (Note 11)
$
122,946

 
$
118,783

Debt guarantees
104,867

 
125,429

Maximum exposure to loss
$
227,813

 
$
244,212