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