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Property, Plant and Equipment (Tables)
 6 Months Ended
Jun. 30, 2014
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment consists of the following (in thousands): 
 
June 30,
2014
 
December 31,
2013
Oil and natural gas properties
 
 
 
Proved(1)
$
10,807,088

 
$
10,972,816

Unproved
309,043

 
531,606

Total oil and natural gas properties
11,116,131

 
11,504,422

Less accumulated depreciation, depletion and impairment
(6,138,833
)
 
(5,762,969
)
Net oil and natural gas properties capitalized costs
4,977,298

 
5,741,453

Land
18,270

 
18,423

Non-oil and natural gas equipment(2)
614,198

 
600,603

Buildings and structures(3)
244,076

 
233,405

Total
876,544

 
852,431

Less accumulated depreciation and amortization
(312,023
)
 
(286,209
)
Other property, plant and equipment, net
564,521

 
566,222

Total property, plant and equipment, net
$
5,541,819

 
$
6,307,675

____________________
(1)
Includes cumulative capitalized interest of approximately $29.0 million and $23.4 million at June 30, 2014 and December 31, 2013, respectively.
(2)
Includes cumulative capitalized interest of approximately $4.3 million at both June 30, 2014 and December 31, 2013.
(3)
Includes cumulative capitalized interest of approximately $14.4 million and $12.0 million at June 30, 2014 and December 31, 2013, respectively.