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Properties and Equipment, Net (Tables)
 9 Months Ended
Sep. 30, 2017
Property, Plant and Equipment [Abstract]  
Schedule of properties and equipment, net
Properties and equipment, net are comprised of the following:
(In thousands)
 
September 30,
2017
 
December 31,
2016
Proved oil and gas properties
 
$
6,967,205

 
$
7,437,604

Unproved oil and gas properties
 
287,147

 
260,543

Gathering and pipeline systems
 
1,451

 
187,846

Land, building and other equipment
 
88,371

 
84,462

 
 
7,344,174

 
7,970,455

Accumulated depreciation, depletion and amortization
 
(3,109,402
)
 
(3,720,330
)
 
 
$
4,234,772

 
$
4,250,125