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Property, Plant and Equipment (Tables)
 6 Months Ended
Jun. 30, 2020
Oil And Gas Property [Abstract]  
Schedule of Asset Retirement Obligations

Asset Retirement Obligations

The discounted asset retirement obligations included in the condensed consolidated balance sheets in current and non-current liabilities, and the changes in that liability during the six months ended June 30, 2020 were as follows (in thousands):

Asset retirement obligations at January 1

 

$

369,478

 

Fair value of asset retirement obligations acquired(1)

 

 

42,670

 

Obligations settled

 

 

(18,496

)

Fair value of asset retirement obligations divested

 

 

(185

)

Accretion expense

 

 

26,211

 

Obligations incurred

 

 

377

 

Changes in estimate

 

 

12,005

 

Asset retirement obligations at June 30

 

$

432,060

 

Less: Current portion

 

 

(44,977

)

Long-term portion

 

$

387,083

 

 

(1)

Six months ended June 30, 2020 includes $41.2 million of asset retirement obligations assumed in the ILX and Castex Acquisition.