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Property, Plant and Equipment (Tables)
 9 Months Ended
Sep. 30, 2017
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
The following table sets forth the Company’s property, plant and equipment:
 
September 30, 2017
 
December 31, 2016
 
(In thousands)
Proved oil and gas properties(1)
$
6,828,758

 
$
6,476,833

Less: accumulated depreciation, depletion, amortization and impairment
(2,258,203
)
 
(1,886,732
)
Proved oil and gas properties, net
4,570,555

 
4,590,101

Unproved oil and gas properties
812,027

 
819,735

Other property and equipment
783,542

 
618,790

Less: accumulated depreciation
(130,506
)
 
(109,059
)
Other property and equipment, net
653,036

 
509,731

Total property, plant and equipment, net
$
6,035,618

 
$
5,919,567

__________________
(1)
Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $44.0 million and $42.9 million at September 30, 2017 and December 31, 2016, respectively.