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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2012
Receivables [Abstract]  
Schedule of Accounts Receivable
 
 
As at
December 31,
 
 
2012
 
2011
Value added tax refunds
 
$
9,766

 
$
8,051

Other
 
2,130

 
2,026

Total
 
$
11,896

 
$
10,077