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Properties and Equipment, Net
 3 Months Ended
Mar. 31, 2017
Property, Plant and Equipment [Abstract]  
Properties and Equipment, Net
Properties and Equipment, Net
Properties and equipment, net are comprised of the following:
(In thousands)
 
March 31,
2017
 
December 31,
2016
Proved oil and gas properties
 
$
7,589,749

 
$
7,437,604

Unproved oil and gas properties
 
296,279

 
260,543

Gathering and pipeline systems
 
188,466

 
187,846

Land, building and other equipment
 
85,257

 
84,462

 
 
8,159,751

 
7,970,455

Accumulated depreciation, depletion and amortization
 
(3,831,391
)
 
(3,720,330
)
 
 
$
4,328,360

 
$
4,250,125


At March 31, 2017, the Company did not have any projects that had exploratory well costs capitalized for a period of greater than one year after drilling.
In February 2016, the Company completed the divestiture of certain proved and unproved oil and gas properties in east Texas for approximately $56.4 million and recognized a $0.5 million gain on sale of assets.