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Income Taxes Schedule of Deferred Income Tax Components (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | $ 52,537 |  |
Change in tax effects of income tax related regulatory assets and liabilities | 23,592 |  |
Tax effect of mark-to-market adjustments | (6,096) |  |
Tax effect of excess pension liability | (9,305) |  |
Adjustment for uncertain income tax positions | 691 |  |
Other | (989) |  |
Deferred income taxes | 60,430 | 56,243 | 124,424
Public Service Company of New Mexico [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | 41,697 |  |
Change in tax effects of income tax related regulatory assets and liabilities | 23,704 |  |
Tax effect of mark-to-market adjustments | (6,121) |  |
Tax effect of excess pension liability | (9,305) |  |
Adjustment for uncertain income tax positions | 691 |  |
Other | (623) |  |
Deferred income taxes | 50,043 | 65,479 | 90,567
Texas-New Mexico Power Company [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | 21,117 |  |
Change in tax effects of income tax related regulatory assets and liabilities | (112) |  |
Other | (343) |  |
Deferred income taxes | $ 20,662 | $ 4,378 | $ 15,478

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- Definition Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6510177 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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