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Interest expense (Tables)
 12 Months Ended
Dec. 31, 2018
Interest Expense [Abstract]  
Schedule of interest expense
Year ended December 31,
 
2018

 
2017

Interest on capital lease obligations
 
$
2,984

 
$
3,023

Interest on credit facilities
 
2,729

 
1,507

Interest on Convertible Debentures
 
2,200

 
1,760

Interest on promissory notes
 
202

 
—

Interest on mortgage
 
105

 
—

Amortization of deferred financing costs (notes 10(c) and note 14(e))
 
539

 
797

Interest on long term debt
 
$
8,759

 
$
7,087

Other interest income
 
(175
)
 
(144
)
 
 
$
8,584

 
$
6,943

During the year ended December 31, 2018, $634 (December 31, 2017 - $nil) of interest was capitalized to property, plant and equipment in relation to a building construction in the year.