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Interest expense
 12 Months Ended
Dec. 31, 2014
Interest Expense [Abstract]  
Interest expense
Interest expense
Year ended December 31,
 
2014

 
2013

Interest on capital lease obligations
 
$
3,103

 
$
2,716

Amortization of deferred financing costs (note 11(c))
 
1,594

 
4,326

Interest on Credit Facility
 
1,268

 
2,424

Interest on Series 1 Debentures
 
6,168

 
12,507

Interest on long term debt
 
$
12,133

 
$
21,973

Other interest expense (income)
 
102

 
(276
)
 
 
$
12,235

 
$
21,697