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Property, Plant and Equipment (Tables)
 3 Months Ended
Mar. 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:
 
March 31, 2014
 
December 31, 2013
 
(In thousands)
Proved oil and gas properties(1)
$
3,985,490

 
$
3,713,525

Less: Accumulated depreciation, depletion, amortization and impairment
(693,011
)
 
(612,380
)
Proved oil and gas properties, net
3,292,479

 
3,101,145

Unproved oil and gas properties
835,412

 
815,433

Total oil and gas properties, net
4,127,891

 
3,916,578

Other property and equipment
200,158

 
188,468

Less: Accumulated depreciation
(30,418
)
 
(25,296
)
Other property and equipment, net
169,740

 
163,172

Total property, plant and equipment, net
$
4,297,631

 
$
4,079,750

 __________________
(1)
Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $32.1 million and $32.6 million at March 31, 2014 and December 31, 2013, respectively.