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Property, Plant and Equipment (Tables)
 6 Months Ended
Jun. 30, 2014
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
The following table sets forth the Company’s property, plant and equipment:
 
June 30, 2014
 
December 31, 2013
 
(In thousands)
Proved oil and gas properties(1)
$
4,305,827

 
$
3,713,525

Less: Accumulated depreciation, depletion, amortization and impairment
(787,418
)
 
(612,380
)
Proved oil and gas properties, net
3,518,409

 
3,101,145

Unproved oil and gas properties
835,755

 
815,433

Total oil and gas properties, net
4,354,164

 
3,916,578

Other property and equipment
231,129

 
188,468

Less: Accumulated depreciation
(36,082
)
 
(25,296
)
Other property and equipment, net
195,047

 
163,172

Total property, plant and equipment, net
$
4,549,211

 
$
4,079,750

 __________________
(1)
Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $33.4 million and $32.6 million at June 30, 2014 and December 31, 2013, respectively.