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Property, Plant and Equipment (Tables)
 3 Months Ended
Mar. 31, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment consists of the following (in thousands): 
 
March 31,
2015
 
December 31,
2014
Oil and natural gas properties
 
 
 
Proved(1)
$
12,020,208

 
$
11,707,147

Unproved
285,942

 
290,596

Total oil and natural gas properties
12,306,150

 
11,997,743

Less accumulated depreciation, depletion and impairment
(7,548,398
)
 
(6,359,149
)
Net oil and natural gas properties capitalized costs
4,757,752

 
5,638,594

Land
16,310

 
16,300

Non-oil and natural gas equipment(2)
602,359

 
602,392

Buildings and structures(3)
269,336

 
263,191

Total
888,005

 
881,883

Less accumulated depreciation and amortization
(308,756
)
 
(305,420
)
Other property, plant and equipment, net
579,249

 
576,463

Total property, plant and equipment, net
$
5,337,001

 
$
6,215,057

____________________
(1)
Includes cumulative capitalized interest of approximately $42.6 million and $38.1 million at March 31, 2015 and December 31, 2014, respectively.
(2)
Includes cumulative capitalized interest of approximately $4.3 million at both March 31, 2015 and December 31, 2014.
(3)
Includes cumulative capitalized interest of approximately $18.1 million and $17.1 million at March 31, 2015 and December 31, 2014, respectively.