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Properties and Equipment, Net (Tables)
 9 Months Ended
Sep. 30, 2018
Property, Plant and Equipment [Abstract]  
Schedule of properties and equipment, net
Properties and equipment, net are comprised of the following:
(In thousands)
 
September 30,
2018
 
December 31,
2017
Proved oil and gas properties
 
$
5,489,836

 
$
4,932,512

Unproved oil and gas properties
 
199,219

 
190,474

Gathering and pipeline systems
 
1,569

 
1,569

Land, building and other equipment
 
86,953

 
82,670

 
 
5,777,577

 
5,207,225

Accumulated depreciation, depletion and amortization
 
(2,411,340
)
 
(2,135,021
)
 
 
$
3,366,237

 
$
3,072,204