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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2013
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,
 
2013
 
2012
 
(In thousands)
Proved oil and gas properties(1)
$
3,713,525

 
$
2,271,711

Less: Accumulated depreciation, depletion, amortization and impairment
(612,380
)
 
(383,564
)
Proved oil and gas properties, net(2)
3,101,145

 
1,888,147

Unproved oil and gas properties
815,433

 
76,417

Other property and equipment
188,468

 
49,732

Less: Accumulated depreciation
(25,296
)
 
(7,696
)
Other property and equipment, net(2)
163,172

 
42,036

Total property, plant and equipment, net
$
4,079,750

 
$
2,006,600


(1)
Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $32.6 million and $20.7 million at December 31, 2013 and 2012, respectively.
(2)
The Company reclassed substantially all of its salt water disposal and other midstream assets from proved oil and gas properties to other property and equipment, effective January 1, 2013.