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Property, Plant and Equipment (Tables)
 3 Months Ended
Mar. 31, 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 three months ended March 31, 2020 were as follows (in thousands):

 

Asset retirement obligations at January 1

 

$

369,478

 

Fair value of asset retirement obligations acquired(1)

 

 

44,489

 

Obligations settled

 

 

(6,302

)

Accretion expense

 

 

12,417

 

Changes in estimate

 

 

5,814

 

Asset retirement obligations at March 31

 

$

425,896

 

Less: Current portion

 

 

(38,028

)

Long-term portion

 

$

387,868

 

 

(1)

Three months ended March 31, 2020 includes $44.5 million of asset retirement obligations assumed in the ILX and Castex Acquisition.