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Accrued liabilities
12 Months Ended
Dec. 31, 2017
Payables and Accruals [Abstract]  
Accrued liabilities
Accrued liabilities
 
 
December 31, 2017

 
December 31, 2016

Accrued interest payable
 
$
714

 
$
85

Payroll liabilities
 
8,828

 
7,733

Liabilities related to equipment leases
 
219

 
123

Current portion of deferred gain on sale-leaseback (note 16(a))
 
1,445

 
586

Dividends payable (note 17(d))
 
510

 
569

Income and other taxes payable
 
2,007

 
2,079

Liabilities related to tire disposal
 
156

 

 
 
$
13,879

 
$
11,175