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v3.3.1.900

Income Taxes Summary of Income Tax Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Beginning balance | $ 15,031 | $ 19,889 | $ 19,198
Additions based on tax positions |  |  | (54)
Additions based on tax positions | 1,214 | 623 |
Additions (reductions) for tax positions of prior years | (9,790) | (5,481) |
Additions (reductions) for tax positions of prior years |  |  | (745)
Settlement payments | 0 | 0 | 0
Ending balance | 6,455 | 15,031 | 19,889
Public Service Company of New Mexico [Member] |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Beginning balance | 12,228 | 11,073 | 10,382
Additions based on tax positions |  |  | (54)
Additions based on tax positions | 1,214 | 623 |
Additions (reductions) for tax positions of prior years | (9,790) |  |
Additions (reductions) for tax positions of prior years |  | 532 | (745)
Settlement payments | 0 | 0 | 0
Ending balance | 3,652 | 12,228 | 11,073
Unrecognized tax benefits that would impact effective tax rate | 3,100 |  |
Texas-New Mexico Power Company [Member] |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Beginning balance | 0 | 6,796 | 6,796
Additions based on tax positions |  |  | 0
Additions based on tax positions | 0 | 0 |
Additions (reductions) for tax positions of prior years | 0 | (6,796) |
Additions (reductions) for tax positions of prior years |  |  | 0
Settlement payments | 0 | 0 | 0
Ending balance | 0 | $ 0 | $ 6,796
PNMR [Member] |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits that would impact effective tax rate | $ 5,900 |  |

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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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