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Long term debt (Tables)
 12 Months Ended
Dec. 31, 2013
Debt Disclosure [Abstract]  
Schedule of long term debt
Long term debt is as follows:
Current:
 
 
 
 
  
 
December 31, 2013

 
December 31, 2012

Credit facilities (note 15(b))
 
$
—

 
$
12,855

Capital lease obligations (note 15(c))
 
14,996

 
13,055

 
 
$
14,996

 
$
25,910

Long term:
 
 
 
 
  
 
December 31, 2013

 
December 31, 2012

Credit facilities (note 15(b))
 
$
—

 
$
49,433

Capital lease obligations (note 15(c))
 
28,299

 
36,492

Series 1 Debentures (note 15(d))
 
75,000

 
225,000

 
 
$
103,299

 
$
310,925
Schedule of credit facilities
Credit Facilities
  
 
December 31, 2013

 
December 31, 2012

Term A Facility
 
$
—

 
$
18,139

Term B Facility
 
—

 
9,107

Total Term Facilities
 
$
—

 
$
27,246

Revolving Facility
 
—

 
35,042

Total credit facilities
 
$
—

 
$
62,288

Less: current portion of Term Facilities
 
—

 
(12,855
)
 
 
$
—

 
$
49,433
Schedule of future minimum lease payments due under capital leases
The minimum lease payments due in each of the next five fiscal years are as follows:
2014
 
$
17,249

2015
 
16,176

2016
 
11,735

2017
 
2,241

Subtotal:
 
$
47,401

Less: amount representing interest
 
(4,106
)
Present value of minimum lease payments
 
$
43,295

Less: current portion
 
(14,996
)
Long term portion
 
$
28,299