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Property, Plant and Equipment (Tables)
 3 Months Ended
Mar. 31, 2019
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
The following table sets forth the Company’s property, plant and equipment:
 
March 31, 2019
 
December 31, 2018
 
(In thousands)
Proved oil and gas properties(1)
$
8,039,585

 
$
7,878,104

Less: Accumulated depreciation, depletion, amortization and impairment
(3,035,748
)
 
(2,853,353
)
Proved oil and gas properties, net
5,003,837

 
5,024,751

Unproved oil and gas properties
1,033,500

 
1,034,085

Other property and equipment(2)
1,216,763

 
1,151,772

Less: Accumulated depreciation
(197,358
)
 
(183,499
)
Other property and equipment, net
1,019,405

 
968,273

Total property, plant and equipment, net
$
7,056,742

 
$
7,027,109

__________________
(1)
Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $41.6 million and $40.5 million at March 31, 2019 and December 31, 2018, respectively.
(2)
Included in the Company’s other property and equipment are estimates of future asset retirement costs of $1.4 million and $1.3 million at March 31, 2019 and December 31, 2018, respectively.