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Accrued liabilities (Tables)
12 Months Ended
Dec. 31, 2015
Payables and Accruals [Abstract]  
Schedule of accrued liabilities
 
 
December 31, 2015

 
December 31, 2014

Accrued interest payable
 
$
526

 
$
1,514

Payroll liabilities
 
5,212

 
9,845

Liabilities related to equipment leases
 
118

 
786

Current portion of deferred gain on sale leaseback (note 16(a))
 
221

 
93

Dividends payable
 

 
697

Income and other taxes payable
 
691

 
2,062

 
 
$
6,768

 
$
14,997