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Asset Retirement Obligations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Asset Retirement Obligations [Line Items] |  |  |
ARO liabilities related to nuclear decommissioning | 80.00% |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |
Beginning balance | $ 127,519 | $ 111,895 | $ 104,170
Liabilities incurred | 1,854 | 0 | 0
Liabilities settled | (968) | (14) | (730)
Accretion expense | 10,680 | 9,170 | 8,625
Revisions to estimated cash flows | 7,594 | 6,468 | (170)
Ending balance | 146,679 | 127,519 | 111,895
Public Service Company of New Mexico |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |
Beginning balance | 126,601 | 111,049 | 103,182
Liabilities incurred | 1,853 | 0 | 0
Liabilities settled | (944) | (14) | (506)
Accretion expense | 10,603 | 9,098 | 8,543
Revisions to estimated cash flows | 7,594 | 6,468 | (170)
Ending balance | 145,707 | 126,601 | 111,049
Texas-New Mexico Power Company |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |
Beginning balance | 754 | 695 | 848
Liabilities incurred | 0 | 0 | 0
Liabilities settled | (24) | 0 | (224)
Accretion expense | 63 | 59 | 71
Revisions to estimated cash flows | 0 | 0 | 0
Ending balance | $ 793 | $ 754 | $ 695

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- Definition Asset Retirement Obligation, Liabilities Related to Nuclear Decommissioning + References No definition available. + Details
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- Definition Asset Retirement Obligations [Line Items] + References No definition available. + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 + Details
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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 35 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6392603&loc=d3e7123-110846 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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