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ASSET RETIREMENT OBLIGATIONS (Tables) | 9 Months Ended
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Sep. 30, 2018
ASSET RETIREMENT OBLIGATIONS |
Schedule of activity related to ARO liability | The Company recorded the following activity related to its ARO liability (in thousands, inclusive of the current portion):
Liability for asset retirement obligations as of December 31, 2017 |  | $ | 4,368
Liabilities settled and divested |  |  | (110)
Additions |  |  | 796
Acquisitions(1) |  |  | 2,465
Accretion expense |  |  | 225
Revisions in estimated cash flows |  |  | (632)
Liability for asset retirement obligations as of September 30, 2018 |  | $ | 7,112
| (1) |  | See Note 3, "Acquisitions and Divestitures," for additional information on the Company's acquisition and divestiture activities.

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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