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Property, Plant and Equipment
3 Months Ended
Mar. 31, 2016
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, 2016
 
December 31, 2015
 
(In thousands)
Proved oil and gas properties(1)
$
5,698,259

 
$
5,655,759

Less: accumulated depreciation, depletion, amortization and impairment
(1,539,515
)
 
(1,428,427
)
Proved oil and gas properties, net
4,158,744

 
4,227,332

Unproved oil and gas properties
628,768

 
628,642

Other property and equipment
477,343

 
443,265

Less: accumulated depreciation
(87,686
)
 
(80,997
)
Other property and equipment, net
389,657

 
362,268

Total property, plant and equipment, net
$
5,177,169

 
$
5,218,242

 __________________
(1)
Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $31.1 million and $30.7 million at March 31, 2016 and December 31, 2015, respectively.