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Suspended Exploratory Well Costs
9 Months Ended
Sep. 30, 2011
Extractive Industries [Abstract] 
SUSPENDED EXPLORATORY WELL COSTS
(8) SUSPENDED EXPLORATORY WELL COSTS
     The following table reflects the changes in capitalized exploratory well costs for the nine months ended September 30, 2011 and the year ended December 31, 2010 (in thousands):
                 
    September 30,     December 31,  
    2011     2010  
Beginning balance at January 1
  $ 23,908     $ 19,052  
Additions to capitalized exploratory well costs pending the determination of proved reserves
    71,779       28,897  
Reclassifications based on determination of proved reserves
    (12,488 )     (24,041 )
Capitalized exploratory well costs charged to expense
           
 
           
Balance at end of period
    83,199       23,908  
Less exploratory well costs that have been capitalized for a period of one year or less
    (68,171 )     (13,181 )
 
           
Capitalized exploratory well costs that have been capitalized for a period greater than one year
  $ 15,028     $ 10,727  
 
           
Number of projects that have exploratory well costs that have been capitalized for a period greater than one year
    5       4  
 
           
     At September 30, 2011, of the $15.0 million of capitalized exploratory well costs that have been capitalized for more than one year, all of the wells are Marcellus Shale wells and are waiting on the completion of pipelines. The following provides an aging of capitalized exploratory well costs that have been suspended for more than one year as of September 30, 2011 (in thousands):
                                         
    Total     2011     2010     2009     2008  
Capitalized exploratory well costs that have been capitalized for more than one year
  $ 15,028     $ 494     $ 10,127     $ 2,884     $ 1,523