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Property, Plant and Equipment
 3 Months Ended
Mar. 31, 2015
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:
 
March 31, 2015
 
December 31, 2014
 
(In thousands)
Proved oil and gas properties(1)
$
5,467,976

 
$
5,156,875

Less: Accumulated depreciation, depletion, amortization and impairment
(1,157,925
)
 
(1,043,121
)
Proved oil and gas properties, net
4,310,051

 
4,113,754

Unproved oil and gas properties
719,662

 
809,265

Total oil and gas properties, net
5,029,713

 
4,923,019

Other property and equipment
356,940

 
313,439

Less: Accumulated depreciation
(57,291
)
 
(49,672
)
Other property and equipment, net
299,649

 
263,767

Total property, plant and equipment, net
$
5,329,362

 
$
5,186,786

 __________________
(1)
Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $37.5 million and $36.9 million at March 31, 2015 and December 31, 2014, respectively.
Impairment. 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 $5.3 million and $0.8 million for the three months ended March 31, 2015 and 2014, respectively. No impairment charges on proved oil and gas properties were recorded for the three months ended March 31, 2015 or 2014.
Divestiture. On March 5, 2014, the Company completed the sale of certain non-operated properties in and around its Sanish position for cash proceeds of approximately $324.9 million, which includes customary post close adjustments. The Company recognized a $187.0 million gain on sale of properties in its Consolidated Statement of Operations for the year ended December 31, 2014.