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Property, Plant and Equipment
 9 Months Ended
Sep. 30, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
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.
As a result of expiring leases and periodic assessments of unproved properties, the Company recorded non-cash impairment charges on its unproved oil and natural gas properties of $56,000 and $0.8 million for the three and nine months ended September 30, 2013, respectively, and $36,000 and $2.6 million for the three and nine months ended September 30, 2012, respectively. No impairment charges on proved oil and natural gas properties were recorded for the three and nine months ended September 30, 2013 or 2012.
Asset acquisitions. On September 26, 2013, the Company acquired certain oil and natural gas assets totaling approximately 25,000 net acres in its East Nesson project area for cash consideration of $54.8 million, subject to further customary post close adjustments (the “East Nesson Acquisitions”). As part of the East Nesson Acquisitions, the Company also agreed to invest, expend and/or incur expenses of $8.2 million in connection with drilling and completion activities for certain wells (see Note 13 - Commitments and Contingencies). Additionally, the Company paid a deposit of $72.5 million in September 2013 for the acquisition of assets in its West Williston project area (see Note 15 - Subsequent Events), which is included in oil and gas properties on the Company’s Condensed Consolidated Balance Sheet at September 30, 2013.