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Property, Plant and Equipment (Tables)
 3 Months Ended
Mar. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment consists of the following (in thousands): 
 
March 31,
2013
 
December 31,
2012
Oil and natural gas properties
 
 
 
Proved(1)
$
9,975,304

 
$
12,262,921

Unproved
548,923

 
865,863

Total oil and natural gas properties
10,524,227

 
13,128,784

Less accumulated depreciation, depletion and impairment
(5,384,132
)
 
(5,231,182
)
Net oil and natural gas properties capitalized costs
5,140,095

 
7,897,602

Land
17,929

 
17,927

Non-oil and natural gas equipment(2)
657,115

 
643,370

Buildings and structures
214,884

 
205,349

Total
889,928

 
866,646

Less accumulated depreciation and amortization
(294,417
)
 
(284,271
)
Other property, plant and equipment, net
595,511

 
582,375

Total property, plant and equipment, net
$
5,735,606

 
$
8,479,977

____________________
(1)
Includes cumulative capitalized interest of $14.7 million and $11.7 million at March 31, 2013 and December 31, 2012, respectively.
(2)
Includes cumulative capitalized interest of approximately $12.4 million and $11.4 million at March 31, 2013 and December 31, 2012, respectively.