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Asset Retirement Obligations | 12 Months Ended
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Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligations | Asset Retirement Obligations The following table presents the balance and activity of the Company’s asset retirement obligations (in thousands):
| Successor |  |  |  |  |  |  | Predecessor
| Year Ended December 31, 2018 |  | Year Ended December 31, 2017 |  | Period from October 2, 2016 through December 31, 2016 |  |  | Period from January 1, 2016 through October 1, 2016
Beginning balance | $ | 77,544 |  | $ | 106,481 |  | $ | 92,413 |  |  | $ | 103,578
Liability incurred upon acquiring and drilling wells | 7,079 |  | 1,336 |  | 121 |  |  | 505
Revisions in estimated cash flows(1) | 870 |  | (28,565) |  | 12,397 |  |  | —
Liability settled or disposed in current period(2) | (31,967) |  | (11,308) |  | (540) |  |  | (36,979)
Accretion | 6,538 |  | 9,600 |  | 2,090 |  |  | 4,365
Impact of fresh start accounting | — |  | — |  | — |  |  | 20,944
Ending balance | 60,064 |  | 77,544 |  | 106,481 |  |  | 92,413
Less: current portion | 25,393 |  | 41,017 |  | 66,154 |  |  | 65,678
Asset retirement obligations, net of current | $ | 34,671 |  | $ | 36,527 |  | $ | 40,327 |  |  | $ | 26,735
____________________ 1.Revisions for the year s ended December 31, 2018 and 2017, and the Successor 2016 Period relate primarily to changes in estimated well lives due to changes in oil and natural gas prices and changes in plugging cost estimates. 2.Liability settled or disposed for the year ended December 31, 2018 includes $26.9 million associated with the Permian Properties sold in November 2018. Liability settled or disposed for the Predecessor 2016 Period includes $34.1 million associated with the WTO Properties sold in January 2016.

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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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