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Property, Plant and Equipment (Tables)
 6 Months Ended
Jun. 30, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment consists of the following (in thousands): 
 
June 30,
2015
 
December 31,
2014
Oil and natural gas properties
 
 
 
Proved(1)
$
12,199,049

 
$
11,707,147

Unproved
261,657

 
290,596

Total oil and natural gas properties
12,460,706

 
11,997,743

Less accumulated depreciation, depletion and impairment
(9,131,153
)
 
(6,359,149
)
Net oil and natural gas properties capitalized costs
3,329,553

 
5,638,594

Land
14,648

 
16,300

Non-oil and natural gas equipment(2)
482,923

 
602,392

Buildings and structures(3)
271,367

 
263,191

Total
768,938

 
881,883

Less accumulated depreciation and amortization
(212,090
)
 
(305,420
)
Other property, plant and equipment, net
556,848

 
576,463

Total property, plant and equipment, net
$
3,886,401

 
$
6,215,057

____________________
(1)
Includes cumulative capitalized interest of approximately $45.6 million and $38.1 million at June 30, 2015 and December 31, 2014, respectively.
(2)
Includes cumulative capitalized interest of approximately $4.3 million at both June 30, 2015 and December 31, 2014.
(3)
Includes cumulative capitalized interest of approximately $19.2 million and $17.1 million at June 30, 2015 and December 31, 2014, respectively.