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Property, Plant and Equipment (Tables)
 9 Months Ended
Sep. 30, 2019
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, 2019December 31, 2018
 (In thousands)
Proved oil and gas properties(1)
$8,550,060  $7,878,104  
Less: Accumulated depreciation, depletion, amortization and impairment(3,400,802) (2,853,353) 
Proved oil and gas properties, net5,149,258  5,024,751  
Unproved oil and gas properties824,446  1,034,085  
Other property and equipment(2)
1,339,268  1,151,772  
Less: Accumulated depreciation(223,362) (183,499) 
Other property and equipment, net1,115,906  968,273  
Total property, plant and equipment, net$7,089,610  $7,027,109  
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(1)Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $42.2 million and $40.5 million at September 30, 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 September 30, 2019 and December 31, 2018, respectively.