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Net Property and Equipment
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment, Net [Abstract]  
Net Property and Equipment
Net Property and Equipment
Net property and equipment includes the following at December 31, 2017 and 2016.
 
 
December 31,
In thousands
 
2017
 
2016
Proved crude oil and natural gas properties
 
$
21,362,199

 
$
19,802,395

Unproved crude oil and natural gas properties
 
365,413

 
429,562

Service properties, equipment and other
 
290,111

 
301,788

Total property and equipment
 
22,017,723

 
20,533,745

Accumulated depreciation, depletion and amortization
 
(9,083,934
)
 
(7,652,518
)
Net property and equipment
 
$
12,933,789

 
$
12,881,227