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Property, Plant and Equipment (Tables)
 9 Months Ended
Sep. 30, 2013
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
The following table sets forth the Company’s property, plant and equipment:
 
 
September 30, 2013
 
December 31, 2012
 
(In thousands)
Proved oil and gas properties (1)
$
2,916,453

 
$
2,271,711

Less: Accumulated depreciation, depletion, amortization and impairment
(568,567
)
 
(383,564
)
Proved oil and gas properties, net (2)
2,347,886

 
1,888,147

Unproved oil and gas properties
128,062

 
76,417

Total oil and gas properties, net
2,475,948

 
1,964,564

Other property and equipment
157,926

 
49,732

Less: Accumulated depreciation
(20,606
)
 
(7,696
)
Other property and equipment, net (2)
137,320

 
42,036

Total property, plant and equipment, net
$
2,613,268

 
$
2,006,600

 __________________
(1)
Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $24.0 million and $20.7 million at September 30, 2013 and December 31, 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.