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ASSET RETIREMENT OBLIGATIONS | 12 Months Ended
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Dec. 31, 2019
ASSET RETIREMENT OBLIGATIONS |
ASSET RETIREMENT OBLIGATIONS | 11. ASSET RETIREMENT OBLIGATIONS The Company records an asset retirement obligation (ARO) on oil and natural gas properties when it can reasonably estimate the fair value of an obligation to perform site reclamation, dismantle facilities or plug and abandon costs. The Company records the ARO liability on the consolidated balance sheets and capitalizes the cost in “Oil and natural gas properties” during the period in which the obligation is incurred. The Company records the accretion of its ARO liabilities in “Depletion, depreciation and accretion” expense in the consolidated statements of operations. The additional capitalized costs are depreciated on a unit-of-production basis. The Company recorded the following activity related to its ARO liability (inclusive of the current portion) (in thousands):
Liability for asset retirement obligations as of December 31, 2017 (Predecessor) |  | $ | 4,368
Liabilities settled and divested (1) |  |  | (590)
Additions |  |  | 988
Acquisitions (1) |  |  | 2,465
Accretion expense |  |  | 329
Revisions in estimated cash flows |  |  | (646)
Liability for asset retirement obligations as of December 31, 2018 (Predecessor) |  | $ | 6,914
Liabilities settled and divested (1) |  |  | (229)
Additions |  |  | 354
Accretion expense |  |  | 307
Revisions in estimated cash flows |  |  | 2,807
Liability for asset retirement obligations as of October 1, 2019 (Predecessor) |  | $ | 10,153
Fair Value Adjustment |  | $ | —
Liability for asset retirement obligations as of October 1, 2019 (Successor) |  | $ | 10,153
Additions |  |  | 293
Accretion expense |  |  | 144
Liability for asset retirement obligations as of December 31, 2019 (Successor) |  | $ | 10,590
| (1) |  | See Note 6, “Acquisitions and Divestitures,” for additional information on the Company’s acquisition and divestiture activities.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
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