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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment

Property, plant and equipment consists of the following (in thousands): 
 
December 31,
 
2013
 
2012
Oil and natural gas properties
 
 
 
Proved(1)
$
10,972,816

 
$
12,262,921

Unproved
531,606

 
865,863

Total oil and natural gas properties
11,504,422

 
13,128,784

Less accumulated depreciation, depletion and impairment
(5,762,969
)
 
(5,231,182
)
Net oil and natural gas properties capitalized costs
5,741,453

 
7,897,602

Land
18,423

 
17,927

Non-oil and natural gas equipment(2)
600,603

 
643,370

Buildings and structures(3)
233,405

 
205,349

Total
852,431

 
866,646

Less accumulated depreciation and amortization
(286,209
)
 
(284,271
)
Other property, plant and equipment, net
566,222

 
582,375

Total property, plant and equipment, net
$
6,307,675

 
$
8,479,977

____________________
(1)
Includes cumulative capitalized interest of approximately $23.4 million and $11.7 million at December 31, 2013 and 2012, respectively.
(2)
Includes cumulative capitalized interest of approximately $4.3 million at both December 31, 2013 and 2012.
(3)
Includes cumulative capitalized interest of approximately $12.0 million and $7.1 million at December 31, 2013 and 2012, respectively.

Cumulative full cost ceiling limitation impairment charges of $3.5 billion at both December 31, 2013 and 2012 were included in accumulated depreciation, depletion and impairment for oil and natural gas properties in the accompanying consolidated balance sheets. There was no full cost ceiling impairment during any of the years ended December 31, 2013, 2012 or 2011. See Note 8 for discussion of impairment of other property, plant and equipment.

The average rates used for depreciation and depletion of oil and natural gas properties were $16.81 per Boe in 2013, $16.93 per Boe in 2012 and $13.57 per Boe in 2011.

Costs 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, 2013 (in thousands):
 
 
 
Year Cost Incurred
 
Total
 
2013
 
2012
 
2011
 
2010 and Prior
Property acquisition
$
515,849

 
$
114,252

 
$
291,999

 
$
34,164

 
$
75,434

Exploration(1)
61,327

 
48,764

 
5,479

 
3,598

 
3,486

Total costs incurred
$
577,176

 
$
163,016

 
$
297,478

 
$
37,762

 
$
78,920

____________________
(1)
Includes $45.6 million of pipe inventory costs incurred ($42.6 million in 2013, $2.8 million in 2012 and $0.2 million in 2010 and prior years).

The Company expects to complete the majority of the evaluation activities within 10 years from the applicable date of acquisition, contingent on the Company’s capital expenditures and drilling program. In addition, the Company’s internal engineers evaluate all properties on at least an annual basis.