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Property, Plant and Equipment (Tables)
 6 Months Ended
Jun. 30, 2015
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, 2015
 
December 31, 2014
 
(In thousands)
Proved oil and gas properties(1)
$
5,589,637

 
$
5,156,875

Less: Accumulated depreciation, depletion, amortization and impairment
(1,273,361
)
 
(1,043,121
)
Proved oil and gas properties, net
4,316,276

 
4,113,754

Unproved oil and gas properties
689,089

 
809,265

Total oil and gas properties, net
5,005,365

 
4,923,019

Other property and equipment
416,417

 
313,439

Less: Accumulated depreciation
(65,125
)
 
(49,672
)
Other property and equipment, net
351,292

 
263,767

Total property, plant and equipment, net
$
5,356,657

 
$
5,186,786

 __________________
(1)
Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $38.2 million and $36.9 million at June 30, 2015 and December 31, 2014, respectively.