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Property, Plant and Equipment (Tables)
 3 Months Ended
Mar. 31, 2016
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment consists of the following (in thousands): 
 
March 31,
2016
 
December 31,
2015
Oil and natural gas properties
 
 
 
Proved(1)
$
11,961,413

 
$
12,529,681

Unproved
350,646

 
363,149

Total oil and natural gas properties
12,312,059

 
12,892,830

Less accumulated depreciation, depletion and impairment
(11,035,575
)
 
(11,149,888
)
Net oil and natural gas properties capitalized costs
1,276,484

 
1,742,942

Land
5,450

 
14,260

Non-oil and natural gas equipment(2)
310,122

 
373,687

Buildings and structures(3)
229,352

 
227,673

Total
544,924

 
615,620

Less accumulated depreciation and amortization
(118,387
)
 
(123,860
)
Other property, plant and equipment, net
426,537

 
491,760

Total property, plant and equipment, net
$
1,703,021

 
$
2,234,702

____________________
(1)
Includes cumulative capitalized interest of approximately $50.3 million and $48.9 million at March 31, 2016 and December 31, 2015, respectively.
(2)
Includes cumulative capitalized interest of approximately $4.3 million at both March 31, 2016 and December 31, 2015.
(3)
Includes cumulative capitalized interest of approximately $20.4 million at both March 31, 2016 and December 31, 2015