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Long-term receivables, investments and other
12 Months Ended
Dec. 31, 2017
Categories Of Noncurrent Financial Assets [Abstract]  
Long-term receivables, investments and other

10. Long-term receivables, investments and other

20172016
Investments in equity securities [note 24]$21,417$14,807
Derivatives [note 24]40,80410,612
Advances receivable from JV Inkai LLP [note 29]58,82090,095
Investment tax credits92,84693,920
Amounts receivable related to tax dispute [note 19]303,222264,042
Other39,05349,506
556,162522,982
Less current portion(36,089)(10,498)
Net$520,073$512,484