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Property and Equipment (Tables)
9 Months Ended
Sep. 30, 2011
Summary of Property and Equipment
The following table summarizes our property and equipment as of the periods presented:
 
   
September 30,
   
December 31,
 
   
2011
   
2010
 
Oil and gas properties:
           
Proved
  $ 2,248,553     $ 2,139,894  
Unproved, net of amortization
    162,962       171,303  
Total oil and gas properties
    2,411,515       2,311,197  
Other property and equipment
    16,751       15,589  
Total property and equipment
    2,428,266       2,326,786  
Accumulated depreciation, depletion and amortization
    (676,005 )     (621,202 )
    $ 1,752,261     $ 1,705,584