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Impairments
 6 Months Ended
Jun. 30, 2012
Impairments [Abstract]  
Asset Impairment Charges [Text Block]
Impairments
 
The following table summarizes impairment charges recorded during the periods presented:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2012
 
2011
 
2012
 
2011
Oil and gas properties
$
28,481

 
$
71,071

 
$
28,481

 
$
71,071

Other
135

 
—

 
135

 
—

 
$
28,616

 
$
71,071

 
$
28,616

 
$
71,071



During the quarter ended June 30, 2012, we recognized an impairment of our Appalachian assets triggered by the expected disposition of these properties in the third quarter of 2012. During the quarter ended June 30, 2011, we recognized an impairment of our Arkoma Basin assets triggered by the expected disposition of these high-cost gas properties in the third quarter of 2011.