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Receivables (Tables)
 3 Months Ended
Mar. 31, 2012
Receivables [Abstract]  
Receivables
Receivables consist of the following (in thousands):
 
March 31, 2012
 
December 31,
2011
Receivables - current portion
 
 
 
Accounts receivable - trade
$
8,278

 
$
14,366

Refundable income tax
11,449

 
11,480

Refundable value added tax
60,153

 
52,968

Accounts receivable - other
4,902

 
4,683

 
$
84,782

 
$
83,497

Receivables - non-current portion
 
 
 
Refundable value added tax
$
41,641

 
$
40,314