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Reconciliation of Asset Retirement Obligation Liability (Tables) | 12 Months Ended
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Dec. 31, 2017
Asset Retirement Obligation [Abstract] |
Schedule of change in asset retirement obligation liability [Table Text Block] | A reconciliation of the Company’s total asset retirement obligation liability is as follows:
| As of December 31,
| 2017 |  | 2016
| (in thousands)
Beginning asset retirement obligations | $ | 123,307 |  |  | $ | 140,874 |
Liabilities incurred (1) | 7,588 |  |  | 21,293 |
Liabilities settled (2) | (30,432 | ) |  | (57,100 | )
Accretion expense | 5,988 |  |  | 7,795 |
Revision to estimated cash flows | 8,019 |  |  | 10,445 |
Ending asset retirement obligations (3)(4) | $ | 114,470 |  |  | $ | 123,307 |
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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) | Balances as of December 31, 2017, and 2016, included $11.4 million and $26.2 million, respectively, of asset retirement obligations associated with oil and gas properties held for sale.
(4) | Balances as of December 31, 2017, and 2016, included $75,000 and $932,000, respectively, related to the Company’s current asset retirement obligation liability, which is recorded in accounts payable and accrued expenses on the accompanying balance sheets.

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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