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Accrued liabilities
12 Months Ended
Dec. 31, 2018
Payables and Accruals [Abstract]  
Accrued liabilities
Accrued liabilities
 
 
December 31, 2018

 
December 31, 2017

Accrued interest payable
 
$
972

 
$
714

Payroll liabilities
 
15,360

 
8,828

Liabilities related to equipment leases
 
423

 
219

Dividends payable (note 18(d))
 
500

 
510

Income and other taxes payable
 
1,749

 
2,007

Liabilities related to tire disposal
 
153

 
156

 
 
$
19,157

 
$
12,434