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Property, Plant and Equipment (Tables)
 9 Months Ended
Sep. 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:
 
September 30, 2018
 
December 31, 2017
 
(In thousands)
Proved oil and gas properties(1)
$
7,566,694

 
$
7,058,782

Less: Accumulated depreciation, depletion, amortization and impairment
(2,689,613
)
 
(2,395,153
)
Proved oil and gas properties, net
4,877,081

 
4,663,629

Unproved oil and gas properties
1,104,450

 
780,173

Other property and equipment
1,088,781

 
868,746

Less: Accumulated depreciation
(170,175
)
 
(139,062
)
Other property and equipment, net
918,606

 
729,684

Total property, plant and equipment, net
$
6,900,137

 
$
6,173,486

__________________
(1)
Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $41.4 million and $39.9 million at September 30, 2018 and December 31, 2017, respectively.