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Properties and Equipment, Net
 3 Months Ended
Mar. 31, 2018
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,
2018
 
December 31,
2017
Proved oil and gas properties
 
$
5,082,995

 
$
4,932,512

Unproved oil and gas properties
 
194,003

 
190,474

Gathering and pipeline systems
 
1,569

 
1,569

Land, building and other equipment
 
81,957

 
82,670

 
 
5,360,524

 
5,207,225

Accumulated depreciation, depletion and amortization
 
(2,214,272
)
 
(2,135,021
)
 
 
$
3,146,252

 
$
3,072,204


At March 31, 2018, the Company did not have any projects that had exploratory well costs capitalized for a period of greater than one year after drilling.
Divestitures
In February 2018, the Company sold its operated and non-operated Eagle Ford Shale assets for $765.0 million. During the fourth quarter of 2017, the Company classified these assets as held for sale and recorded an impairment charge of $414.3 million associated with the proposed sale of these properties. Upon closing the sale in the first quarter of 2018, the Company recognized a loss on sale of oil and gas properties of $44.8 million.