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Gain on Sale of Assets (Tables)
3 Months Ended
Mar. 31, 2013
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract]  
Components of Gain on Sale of Assets
 
For the three months ended March 31,
 
2013
 
2012
Gain on sale of Burkina Properties
$

 
$
22,385

Gain/(loss) on sale of other assets
72

 
(15
)
Total gain on sale of assets
$
72

 
$
22,370