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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
The following table sets forth the Company’s property, plant and equipment:
 
December 31,
 
2017
 
2016
 
(In thousands)
Proved oil and gas properties(1)
$
7,058,782

 
$
6,476,833

Less: Accumulated depreciation, depletion, amortization and impairment
(2,395,153
)
 
(1,886,732
)
Proved oil and gas properties, net
4,663,629

 
4,590,101

Unproved oil and gas properties
780,173

 
819,735

Other property and equipment
868,746

 
618,790

Less: Accumulated depreciation
(139,062
)
 
(109,059
)
Other property and equipment, net
729,684

 
509,731

Total property, plant and equipment, net
$
6,173,486

 
$
5,919,567

__________________ 
(1)
Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $39.9 million and $42.9 million at December 31, 2017 and 2016, respectively.