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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2018
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,
 
2018
 
2017
 
(In thousands)
Proved oil and gas properties(1)
$
7,878,104

 
$
7,058,782

Less: Accumulated depreciation, depletion, amortization and impairment
(2,853,353
)
 
(2,395,153
)
Proved oil and gas properties, net
5,024,751

 
4,663,629

Unproved oil and gas properties
1,034,085

 
780,173

Other property and equipment(2)
1,151,772

 
868,746

Less: Accumulated depreciation
(183,499
)
 
(139,062
)
Other property and equipment, net
968,273

 
729,684

Total property, plant and equipment, net
$
7,027,109

 
$
6,173,486

__________________ 
(1)
Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $40.5 million and $38.4 million at December 31, 2018 and 2017, respectively.
(2)
Included in the Company’s other property and equipment are estimates of future asset retirement costs of $1.3 million and $1.5 million at December 31, 2018 and 2017, respectively.