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Property, Plant and Equipment (Tables)
 3 Months Ended
Mar. 31, 2014
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment consists of the following (in thousands): 
 
March 31,
2014
 
December 31,
2013
Oil and natural gas properties
 
 
 
Proved(1)
$
10,443,534

 
$
10,972,816

Unproved
292,459

 
531,606

Total oil and natural gas properties
10,735,993

 
11,504,422

Less accumulated depreciation, depletion and impairment
(6,043,109
)
 
(5,762,969
)
Net oil and natural gas properties capitalized costs
4,692,884

 
5,741,453

Land
18,404

 
18,423

Non-oil and natural gas equipment(2)
602,706

 
600,603

Buildings and structures(3)
237,578

 
233,405

Total
858,688

 
852,431

Less accumulated depreciation and amortization
(299,346
)
 
(286,209
)
Other property, plant and equipment, net
559,342

 
566,222

Total property, plant and equipment, net
$
5,252,226

 
$
6,307,675

____________________
(1)
Includes cumulative capitalized interest of approximately $25.9 million and $23.4 million at March 31, 2014 and December 31, 2013, respectively.
(2)
Includes cumulative capitalized interest of approximately $4.3 million at both March 31, 2014 and December 31, 2013.
(3)
Includes cumulative capitalized interest of approximately $13.4 million and $12.0 million at March 31, 2014 and December 31, 2013, respectively.