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Asset Retirement Obligations | 12 Months Ended
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Dec. 31, 2019
Asset Retirement Obligations [Abstract] |
Asset Retirement Obligations | 11. ASSET RETIREMENT OBLIGATIONS The following table summarizes the changes in the Company’s asset retirement obligations:
|  | Year Ended December 31,
(in thousands) |  | 2019 |  | 2018 |  |  | 2017
Beginning balance |  | $ | 14,816 |  | $ | 20,163 |  | $ | 18,612
Accretion |  |  | 812 |  |  | 1,180 |  |  | 951
Additions |  |  | 595 |  |  | — |  |  | —
Acquisitions and dispositions |  |  | — |  |  | — |  |  | (103)
Revisions |  |  | (379) |  |  | (6,527) |  |  | 703
Ending balance |  | $ | 15,844 |  | $ | 14,816 |  | $ | 20,163
Accretion is recorded in the line item “Depreciation, depletion and amortization” on the consolidated statements of operations. The Company is required under the Etame PSC for the Etame Marin block in Gabon to conduct abandonment studies to update the amounts being funded for the eventual abandonment of the offshore wells, platforms and facilities on the Etame Marin block. The current abandonment study was completed in November 2018. In 2018, the Company recorded a downward revision of $6.5 million to the ARO liability as a result of a change in the expected timing of the abandonment costs when the period of exploitation under the Etame PSC was extended to at least September 16, 2028 as discussed further in Note 9. The most recently completed abandonment study was in November 2018. In 2019, the Company recorded $0.6 million in additions associated with the Etame 9H and Etame 11H development wells. In December 2019, the Company recorded $0.4 million downward revision associated with the Mutamba Iroru block onshore Gabon. As discussed further in Note 2, on February 28, 2019, t he Gabonese branch of the international commercial bank holding the abandonment funds in a U.S. dollar denominated account advised that the bank regulator required transfer of the funds to the Central Bank for CEMAC for conversion to local currency with a credit back to the Gabonese branch in local currency.

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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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