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Property, Plant and Equipment (Tables)
 6 Months Ended
Jun. 30, 2020
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, 2020December 31, 2019
 (In thousands)
Proved oil and gas properties(1)
$9,015,068  $8,724,376  
Less: Accumulated depreciation, depletion, amortization and impairment(8,217,194) (3,601,019) 
Proved oil and gas properties, net797,874  5,123,357  
Unproved oil and gas properties343,642  738,662  
Other property and equipment(2)
1,314,870  1,279,653  
Less: Accumulated depreciation and impairment(304,196) (163,896) 
Other property and equipment, net1,010,674  1,115,757  
Total property, plant and equipment, net$2,152,190  $6,977,776  
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(1)Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $42.3 million at both June 30, 2020 and December 31, 2019.
(2)Included in the Company’s other property and equipment are estimates of future asset retirement costs of $1.4 million at both June 30, 2020 and December 31, 2019.