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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2021
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations Asset Retirement Obligations
Our ARO liabilities are based on our net ownership in wells and facilities and management’s estimate of the costs to abandon and remediate those wells and facilities together with management’s estimate of the future timing of the costs to be incurred. The following table summarizes activity related to our ARO liabilities for the years ended December 31, 2021 and 2020:

Year Ended December 31,
20212020
(in thousands)
Balance at beginning of period
$109,616 $83,141 
Additions(1)
156,201 21,860 
Retirements(1,252)(881)
Accretion expense7,121 5,694 
Revisions— (198)
Noncontrolling Interest Carve-out(3,810)— 
Sale(1,869)— 
Balance at end of period266,007 109,616 
Less: current portion(7,905)(3,213)
Balance at end of period, noncurrent portion$258,102 $106,403 
(1)During the year ended December 31, 2021, our ARO additions related to properties acquired in our 2021 acquisitions. During the year ended December 31, 2020, our ARO additions primarily related to properties acquired in the Titan Acquisition. See NOTE 3 – Acquisitions and Divestitures for additional information.