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Property, Plant and Equipment (Tables)
 6 Months Ended
Jun. 30, 2018
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
The following table sets forth the Company’s property, plant and equipment:
 
June 30, 2018
 
December 31, 2017
 
(In thousands)
Proved oil and gas properties(1)
$
7,340,228

 
$
7,058,782

Less: Accumulated depreciation, depletion, amortization and impairment
(2,532,668
)
 
(2,395,153
)
Proved oil and gas properties, net
4,807,560

 
4,663,629

Unproved oil and gas properties
1,084,606

 
780,173

Other property and equipment
1,024,104

 
868,746

Less: Accumulated depreciation
(159,029
)
 
(139,062
)
Other property and equipment, net
865,075

 
729,684

Total property, plant and equipment, net
$
6,757,241

 
$
6,173,486

__________________
(1)
Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $44.0 million and $39.9 million at June 30, 2018 and December 31, 2017, respectively.