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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract] |
Reconciliation of Asset Retirement Obligations | A reconciliation of the ARO liabilities is as follows:
| PNMR |  | PNM |  | TNMP
| (In thousands)
Liability at December 31, 2014 | $ | 104,170 |  |  | $ | 103,182 |  |  | $ | 848 |
Liabilities incurred | — |  |  | — |  |  | — |
Liabilities settled | (730 | ) |  | (506 | ) |  | (224 | )
Accretion expense | 8,625 |  |  | 8,543 |  |  | 71 |
Revisions to estimated cash flows | (170 | ) |  | (170 | ) |  | — |
Liability at December 31, 2015 | 111,895 |  |  | 111,049 |  |  | 695 |
Liabilities incurred | — |  |  | — |  |  | — |
Liabilities settled | (14 | ) |  | (14 | ) |  | — |
Accretion expense | 9,170 |  |  | 9,098 |  |  | 59 |
Revisions to estimated cash flows | 6,468 |  |  | 6,468 |  |  | — |
Liability at December 31, 2016 | 127,519 |  |  | 126,601 |  |  | 754 |
Liabilities incurred(1) | 1,854 |  |  | 1,853 |  |  | — |
Liabilities settled | (968 | ) |  | (944 | ) |  | (24 | )
Accretion expense | 10,680 |  |  | 10,603 |  |  | 63 |
Revisions to estimated cash flows | 7,594 |  |  | 7,594 |  |  | — |
Liability at December 31, 2017 | $ | 146,679 |  |  | $ | 145,707 |  |  | $ | 793 |
(1) Represents the obligation related to the additional ownership interest in SJGS Unit 4 that PNM acquired on December 31, 2017 due to the restructuring of the ownership of SJGS.

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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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