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Costs Incurred for Property Acquisitions Exploration and Development
 6 Months Ended
Jun. 30, 2011
Extractive Industries [Abstract]  
COSTS INCURRED FOR PROPERTY ACQUISITIONS, EXPLORATION AND DEVELOPMENT
(18) COSTS INCURRED FOR PROPERTY ACQUISITIONS, EXPLORATION AND DEVELOPMENT(a)
                 
    Six Months     Year  
    Ended     Ended  
    June 30,     December 31,  
    2011     2010  
    (in thousands)  
Acquisitions:
               
Unproved leasehold
  $ —     $ 3,697  
Proved properties
    —       130,767  
Asset retirement obligations
    —       556  
Acreage purchases
    67,140       151,572  
Development
    476,702       727,720  
Exploration:
               
Drilling
    68,936       50,433  
Expense
    36,513       56,298  
Stock-based compensation expense
    2,266       4,209  
Gas gathering facilities:
               
Development
    11,540       19,627  
 
           
Subtotal
    663,097       1,144,879  
Asset retirement obligations
    12,716       (6,370 )
 
           
Total costs incurred – continuing operations
    675,813       1,138,509  
Discontinued operations
    3,502       73,369  
 
           
Total costs incurred
  $ 679,315     $ 1,211,878  
 
           
 
(a)   Includes costs incurred whether capitalized or expensed and include our Barnett operations.