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Property, Plant and Equipment (Tables)
 6 Months Ended
Jun. 30, 2016
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment consists of the following (in thousands): 
 
June 30,
2016
 
December 31,
2015
Oil and natural gas properties
 
 
 
Proved(1)
$
12,029,734

 
$
12,529,681

Unproved
338,573

 
363,149

Total oil and natural gas properties
12,368,307

 
12,892,830

Less accumulated depreciation, depletion and impairment
(11,313,610
)
 
(11,149,888
)
Net oil and natural gas properties capitalized costs
1,054,697

 
1,742,942

Land
5,210

 
14,260

Non-oil and natural gas equipment(2)
306,989

 
373,687

Buildings and structures(3)
230,685

 
227,673

Total
542,884

 
615,620

Less accumulated depreciation and amortization
(122,329
)
 
(123,860
)
Other property, plant and equipment, net
420,555

 
491,760

Total property, plant and equipment, net
$
1,475,252

 
$
2,234,702

____________________
(1)
Includes cumulative capitalized interest of approximately $50.9 million and $48.9 million at June 30, 2016 and December 31, 2015, respectively.
(2)
Includes cumulative capitalized interest of approximately $4.3 million at both June 30, 2016 and December 31, 2015.
(3)
Includes cumulative capitalized interest of approximately $20.4 million at both June 30, 2016 and December 31, 2015