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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 | Note 14 – Asset Retirement Obligations Please refer to Asset Retirement Obligations in Note 1 – Summary of Significant Accounting Policies for a discussion of the initial and subsequent measurements of asset retirement obligation liabilities and the significant assumptions used in the estimates. A reconciliation of the Company’s total asset retirement obligation liability is as follows:
| As of December 31,
| 2018 |  | 2017
| (in thousands)
Beginning asset retirement obligations | $ | 114,470 |  |  | $ | 123,307 |
Liabilities incurred (1) | 4,054 |  |  | 7,588 |
Liabilities settled (2) | (33,024 | ) |  | (30,432 | )
Accretion expense | 4,438 |  |  | 5,988 |
Revision to estimated cash flows | 4,256 |  |  | 8,019 |
Ending asset retirement obligations (3)(4) | $ | 94,194 |  |  | $ | 114,470 |
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(1) | Reflects liabilities incurred through drilling activities and acquisitions of drilled wells.
(2) | Reflects liabilities settled through plugging and abandonment activities and divestitures of properties.
(3) | Balance as of December 31, 2017, included $11.4 million of asset retirement obligations associated with oil and gas properties held for sale.
(4) | Balances as of December 31, 2018, and 2017, included $2.3 million and $75,000, respectively, related to the Company’s current asset retirement obligation liability, which is recorded in the accounts payable and accrued expenses line item on the accompanying balance sheets.

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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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