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Variable interest entities (Tables)
12 Months Ended
Dec. 31, 2018
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, 2018 and 2017:
 
As of December 31,
 
2018
 
2017
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