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Impairments
12 Months Ended
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Impairments
Impairments 
The following table summarizes impairment charges recorded during the periods presented:
 
Year Ended December 31,
 
2014
 
2013
 
2012
Oil and gas properties
$
791,809

 
$
132,224

 
$
103,417

Other – tubular inventory and well materials

 

 
1,067

 
$
791,809

 
$
132,224

 
$
104,484


The following table summarizes the aggregate fair values of the assets described below, by asset category and the classification of inputs within the fair value measurement hierarchy, at the respective dates of impairment:
 
Fair Value
 
 
 
 
 
 
 
Measurement
 
Level 1
 
Level 2
 
Level 3
Year ended December 31, 2014:
 
 
 
 
 
 
 
Long-lived assets held for use
$
65,203

 
$

 
$

 
$
65,203

Long-lived assets sold during the year
70,733

 

 

 
70,733

Year ended December 31, 2013:
 
 
 
 
 
 
 
Long-lived assets held for use
$
93,945

 
$

 
$

 
$
93,945

Year ended December 31, 2012:
 
 
 
 
 
 
 
Long-lived assets held for use
$
14,801

 

 

 
14,801

Long-lived assets sold during the year
96,099

 

 

 
96,099


In 2014, we recognized oil and gas asset impairments of: (i) $667.8 million in the East Texas, Granite Wash and Marcellus regions due to the substantial decline in current and expected future commodity prices in the fourth quarter of 2014, (ii) $6.1 million in connection with an uneconomic field drilled in the Mid-Continent region and (iii) $117.9 million to write-down our Selma Chalk assets in Mississippi triggered by the disposition of those properties. In 2013, we recognized oil and gas impairments of: (i) $121.8 million in the Granite Wash, (ii) $9.5 million in the Marcellus Shale and (iii) $0.9 million in the Selma Chalk, in each case due primarily to market declines in current and expected future natural gas prices. In 2012, we recognized a $28.4 million impairment of our assets in West Virginia, Kentucky and Virginia triggered by the disposition of these properties, and a $75.0 million impairment of our Marcellus Shale assets due primarily to market declines in natural gas prices and the resultant reduction in proved natural gas reserves. In 2012, we also recognized an impairment of $1.1 million attributable to tubular inventory and well materials.