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Property, Plant and Equipment
9 Months Ended
Sep. 30, 2014
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment
The following table sets forth the Company’s property, plant and equipment:
 
September 30, 2014
 
December 31, 2013
 
(In thousands)
Proved oil and gas properties(1)
$
4,717,065

 
$
3,713,525

Less: Accumulated depreciation, depletion, amortization and impairment
(890,785
)
 
(612,380
)
Proved oil and gas properties, net
3,826,280

 
3,101,145

Unproved oil and gas properties
829,359

 
815,433

Total oil and gas properties, net
4,655,639

 
3,916,578

Other property and equipment
261,665

 
188,468

Less: Accumulated depreciation
(42,452
)
 
(25,296
)
Other property and equipment, net
219,213

 
163,172

Total property, plant and equipment, net
$
4,874,852

 
$
4,079,750

 __________________
(1)
Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $36.4 million and $32.6 million at September 30, 2014 and December 31, 2013, respectively.
As a result of expiring leases and periodic assessments of unproved properties, the Company recorded non-cash impairment charges on its unproved oil and natural gas properties of $1.4 million and $2.2 million for the three and nine months ended September 30, 2014, respectively, and $0.1 million and $0.8 million for the three and nine months ended September 30, 2013, respectively. No impairment charges on proved oil and natural gas properties were recorded for the three and nine months ended September 30, 2014 or 2013.