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Information On Oil And Natural Gas Producing Activities (Tables)
 12 Months Ended
Sep. 30, 2013
Information On Oil And Natural Gas Producing Activities [Abstract]  
Summary Of Sales Through Various Operators Or Purchasers

 

 

 

 

 

 

 

 

 

 

 

 

 

2013

 

2012

 

2011

 

 

 

 

 

 

Southwestern Energy Company
20% 

 
15% 

 
9% 

Chesapeake Operating, Inc.
10% 

 
13% 

 
15% 

Devon Energy Corp.
7% 

 
10% 

 
9% 

Apache Corporation
6% 

 
4% 

 
2% 

Newfield Exploration
5% 

 
7% 

 
14%