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Properties and Equipment, Net (Tables)
 3 Months Ended
Mar. 31, 2019
Property, Plant and Equipment [Abstract]  
Schedule of properties and equipment, net
Properties and equipment, net are comprised of the following
(In thousands)
 
March 31,
2019
 
December 31,
2018
Proved oil and gas properties
 
$
5,919,534

 
$
5,717,145

Unproved oil and gas properties
 
186,590

 
194,435

Land, building and other equipment
 
94,305

 
94,797

 
 
6,200,429

 
6,006,377

Accumulated depreciation, depletion and amortization
 
(2,625,807
)
 
(2,542,771
)
 
 
$
3,574,622

 
$
3,463,606