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PROPERTY AND EQUIPMENT (Tables)
6 Months Ended
Jun. 30, 2020
Property, Plant and Equipment [Abstract]  
Schedule of property and equipment
The major categories of property and equipment and related accumulated depletion, depreciation, amortization ("DD&A") and impairment as of June 30, 2020 and December 31, 2019 are as follows:
June 30, 2020December 31, 2019
(In thousands)
Oil and natural gas properties$10,730,992  $10,595,735  
Accumulated DD&A and impairment(8,415,756) (7,191,957) 
Oil and natural gas properties, net2,315,236  3,403,778  
Other depreciable property and equipment91,317  91,198  
Land5,521  5,521  
Accumulated DD&A(41,708) (36,703) 
Other property and equipment, net55,130  60,016  
Property and equipment, net$2,370,366  $3,463,794  
Schedule of non-producing properties excluded from amortization by area
The following table summarizes the Company’s unevaluated properties excluded from amortization by area at June 30, 2020:
June 30, 2020
(In thousands)
Utica$874,886  
MidContinent687,169  
Other2,134  
$1,564,189  
Schedule of asset retirement obligation
A reconciliation of the Company’s asset retirement obligation for the six months ended June 30, 2020 and 2019 is as follows:
June 30, 2020June 30, 2019
(In thousands)
Asset retirement obligation, beginning of period$60,355  $79,952  
Liabilities incurred1,553  5,153  
Liabilities settled—  (117) 
Liabilities removed due to divestitures(2,033) —  
Accretion expense1,496  2,426  
Revisions in estimated cash flows—  1,077  
Asset retirement obligation as of end of period61,371  88,491