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Property, Plant and Equipment (Tables)
 6 Months Ended
Jun. 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:
 
June 30, 2017
 
December 31, 2016
 
(In thousands)
Proved oil and gas properties(1)
$
6,671,833

 
$
6,476,833

Less: accumulated depreciation, depletion, amortization and impairment
(2,130,330
)
 
(1,886,732
)
Proved oil and gas properties, net
4,541,503

 
4,590,101

Unproved oil and gas properties
816,242

 
819,735

Other property and equipment
695,592

 
618,790

Less: accumulated depreciation
(122,323
)
 
(109,059
)
Other property and equipment, net
573,269

 
509,731

Total property, plant and equipment, net
$
5,931,014

 
$
5,919,567

__________________
(1)
Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $43.3 million and $42.9 million at June 30, 2017 and December 31, 2016, respectively.