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Supplemental Cash Flow Information (Tables)
 9 Months Ended
Sep. 30, 2012
Supplemental Cash Flow Information [Abstract]  
Schedule of Changes in Working Capital
Changes in working capital for the three and nine months are as follows:
 
For the three months ended
September 30,
 
For the nine months ended
September 30,
 
2012
 
2011
 
2012
 
2011
Decrease/(increase) in accounts receivable
$
2,928

 
$
(1,886
)
 
$
1,964

 
$
(4,690
)
(Increase)/decrease in inventories
(3,269
)
 
1,177

 
(13,773
)
 
756

(Increase)/decrease in deposits
(2,479
)
 
147

 
(3,193
)
 
(553
)
(Decrease)/increase in accounts payable and accrued liabilities
(2,702
)
 
4,265

 
(8,230
)
 
(14,534
)
Other
(8
)
 
565

 
(877
)
 
(1,524
)
Total Changes in working capital
$
(5,530
)
 
$
4,268

 
$
(24,109
)
 
$
(20,545
)