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Asset Retirement Obligations (Tables)
 9 Months Ended
Sep. 30, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation

The following table presents the changes in carrying amounts of the asset retirement obligations associated with our working interests in crude oil and natural gas properties:
 
Amount
 
(in thousands)
 
 
Balance at December 31, 2018
$
115,021

Obligations incurred with development activities
4,573

Accretion expense
4,503

Revisions in estimated cash flows
16,648

Obligations discharged with asset retirements
(16,796
)
Obligations discharged with divestitures
(6,894
)
Balance at September 30, 2019
117,055

Current portion
(30,873
)
Long-term portion
$
86,182