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Other assets (Tables)
 12 Months Ended
Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract]  
Schedule of other assets
As at
Dec 31
2017

Dec 31
2016

Restricted cash
$
27,863

$
35,386

Chile VAT receivable
25,456

23,406

Investment in Carbon Recycling International
4,502

4,502

Defined benefit pension plans (note 20)
6,650

5,862

Other
13,555

9,628

 
$
78,026

$
78,784