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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
The following table sets forth the Company’s property, plant and equipment:
 
December 31,
 
2014
 
2013
 
(In thousands)
Proved oil and gas properties(1)
$
5,156,875

 
$
3,713,525

Less: Accumulated depreciation, depletion, amortization and impairment
(1,043,121
)
 
(612,380
)
Proved oil and gas properties, net
4,113,754

 
3,101,145

Unproved oil and gas properties
809,265

 
815,433

Other property and equipment
313,439

 
188,468

Less: Accumulated depreciation
(49,672
)
 
(25,296
)
Other property and equipment, net
263,767

 
163,172

Total property, plant and equipment, net
$
5,186,786

 
$
4,079,750

__________________ 
(1)
Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $36.9 million and $32.6 million at December 31, 2014 and 2013, respectively.