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Receivables (Tables)
 3 Months Ended
Mar. 31, 2013
Receivables [Abstract]  
Receivables
Receivables consist of the following (in thousands):
 
March 31, 2013
 
December 31, 2012
Receivables - current portion
 
 
 
Accounts receivable - trade
$
9,487

 
$
8,701

Refundable income tax
4,131

 
9,331

Refundable value added tax
49,149

 
40,020

Accounts receivable - other
5,415

 
4,386

 
$
68,182

 
$
62,438

Receivables - non-current portion
 
 
 
Refundable value added tax
$
39,061

 
$
48,767