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Interest expense
 12 Months Ended
Dec. 31, 2016
Interest Expense [Abstract]  
Interest expense
Interest expense
Year ended December 31,
 
2016

 
2015

Interest on capital lease obligations
 
$
2,836

 
$
3,044

Amortization of deferred financing costs (note 10(c) and 13(a))
 
572

 
1,961

Interest on Credit Facility
 
1,593

 
1,031

Interest on Series 1 Debentures
 
977

 
3,986

Interest on long term debt
 
$
5,978

 
$
10,022

Other interest income
 
(194
)
 
(142
)
 
 
$
5,784

 
$
9,880