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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment consists of the following (in thousands): 
 
December 31,
 
2014
 
2013
Oil and natural gas properties
 
 
 
Proved(1)
$
11,707,147

 
$
10,972,816

Unproved
290,596

 
531,606

Total oil and natural gas properties
11,997,743

 
11,504,422

Less accumulated depreciation, depletion and impairment
(6,359,149
)
 
(5,762,969
)
Net oil and natural gas properties capitalized costs
5,638,594

 
5,741,453

Land
16,300

 
18,423

Non-oil and natural gas equipment(2)
602,392

 
600,603

Buildings and structures(3)
263,191

 
233,405

Total
881,883

 
852,431

Less accumulated depreciation and amortization
(305,420
)
 
(286,209
)
Other property, plant and equipment, net
576,463

 
566,222

Total property, plant and equipment, net
$
6,215,057

 
$
6,307,675

____________________
(1)
Includes cumulative capitalized interest of approximately $38.1 million and $23.4 million at December 31, 2014 and 2013, respectively.
(2)
Includes cumulative capitalized interest of approximately $4.3 million at both December 31, 2014 and 2013.
(3)
Includes cumulative capitalized interest of approximately $17.1 million and $12.0 million at December 31, 2014 and 2013, respectively.
Capitalized Costs of Unproved Properties Excluded from Amortization
The following table summarizes the costs, by year incurred, related to unproved properties and pipe inventory, which were excluded from oil and natural gas properties subject to amortization at December 31, 2014 (in thousands):
 
 
 
Year Cost Incurred
 
Total
 
2014
 
2013
 
2012
 
2011 and Prior
Property acquisition
$
247,485

 
$
64,776

 
$
21,723

 
$
98,530

 
$
62,456

Exploration(1)
96,752

 
48,614

 
36,938

 
4,302

 
6,898

Total costs incurred
$
344,237

 
$
113,390

 
$
58,661

 
$
102,832

 
$
69,354

____________________
(1)
Includes $53.6 million of pipe inventory costs incurred ($21.3 million in 2014, $30.7 million in 2013 and $1.6 million in 2012 and prior years).