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Asset Retirement Obligations | 12 Months Ended
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Dec. 31, 2017
Asset Retirement Obligations [Abstract] |
Asset Retirement Obligations | 7. ASSET RETIREMENT OBLIGATIONS The following table summarizes the changes in our asset retirement obligations: ﻿
﻿ |  |  |  |  |  |  |  |  |
﻿(in thousands) |  |  | 2017 |  |  | 2016 |  |  | 2015
﻿Balance at January 1 |  | $ | 18,612 |  | $ | 16,166 |  | $ | 14,846
﻿Accretion |  |  | 951 |  |  | 903 |  |  | 778
﻿Additions |  |  | — |  |  | — |  |  | 1,085
﻿Acquisitions and dispositions |  |  | (103) |  |  | 1,544 |  |  | —
﻿Revisions |  |  | 703 |  |  | (1) |  |  | (543)
﻿Balance at December 31 |  | $ | 20,163 |  | $ | 18,612 |  | $ | 16,166
Accretion is recorded in the line item “Depreciation, depletion and amortization” of our consolidated statements of operations. We are required under the Etame PSC to conduct regular abandonment studies to update the estimated costs to abandon the offshore wells, platforms and facilities on the Etame Marin block. The most recently completed abandonment study was in January 2016. The final results of the abandonment study resulted in an increase in the costs necessary to fund future abandonment obligations.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
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