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Property, Plant and Equipment
 9 Months Ended
Sep. 30, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment

Property, plant and equipment consists of the following (in thousands): 
 
September 30,
2013
 
December 31,
2012
Oil and natural gas properties
 
 
 
Proved(1)
$
10,663,810

 
$
12,262,921

Unproved
529,032

 
865,863

Total oil and natural gas properties
11,192,842

 
13,128,784

Less accumulated depreciation, depletion and impairment
(5,643,158
)
 
(5,231,182
)
Net oil and natural gas properties capitalized costs
5,549,684

 
7,897,602

Land
18,423

 
17,927

Non-oil and natural gas equipment(2)
610,740

 
643,370

Buildings and structures(3)
230,508

 
205,349

Total
859,671

 
866,646

Less accumulated depreciation and amortization
(283,281
)
 
(284,271
)
Other property, plant and equipment, net
576,390

 
582,375

Total property, plant and equipment, net
$
6,126,074

 
$
8,479,977

____________________
(1)
Includes cumulative capitalized interest of approximately $20.7 million and $11.7 million at September 30, 2013 and December 31, 2012, respectively.
(2)
Includes cumulative capitalized interest of approximately $4.3 million at both September 30, 2013 and December 31, 2012.
(3)
Includes cumulative capitalized interest of approximately $10.7 million and $7.1 million at September 30, 2013 and December 31, 2012, respectively.

During the second and third quarters of 2013, the Company committed to plans to sell various drilling and corporate assets. These assets are included in other current assets in the accompanying unaudited condensed consolidated balance sheet at September 30, 2013 as the Company intends to sell the assets within a year. The net book value of the drilling assets was adjusted to fair value, resulting in impairments of $0.5 million and $11.1 million during the three and nine-month periods ended September 30, 2013, respectively, and a combined remaining net book value of $6.2 million at September 30, 2013. Fair value for the drilling assets was estimated based on the most recent offers received from third parties with consideration of current market conditions. Based on the limited market activity for a majority of these assets, the valuation is considered Level 3 under the fair value hierarchy, as described in Note 4. The net book value of the corporate asset was adjusted to fair value, resulting in an impairment of $2.9 million during the nine-month period ended September 30, 2013 and remaining net book value of $17.0 million. The fair value of the corporate asset was based on a current offer from a third-party purchaser, which is considered a Level 3 input.

In the second and third quarters of 2013, the Company evaluated certain midstream pipe inventory, natural gas compressors and a compressor station for impairment after determining that their future use was limited. As a result of these evaluations, the Company recorded impairments of $0.2 million and $2.3 million during the three and nine-month periods ended September 30, 2013, respectively, on these assets to reduce their carrying value to market value.