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Properties and Equipment, Net (Tables)
 3 Months Ended
Mar. 31, 2020
Property, Plant and Equipment [Abstract]  
Schedule of properties and equipment, net
Properties and equipment, net are comprised of the following:
(In thousands)
 
March 31,
2020
 
December 31,
2019
Proved oil and gas properties
 
$
6,674,182

 
$
6,508,443

Unproved oil and gas properties
 
73,215

 
133,475

Land, buildings and other equipment
 
105,721

 
104,700

 
 
6,853,118

 
6,746,618

Accumulated depreciation, depletion and amortization
 
(2,932,621
)
 
(2,890,912
)
 
 
$
3,920,497

 
$
3,855,706