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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Equity [Abstract] |  |  |  |
Percentage of Pension Liability Adjustment Capitalized into Construction Work In Process |  |  | 23.00% | 23.00%
Percentage of Pension Liability Adjustment Capitalized into Other Accounts |  |  | 2.70% | 2.10%
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning Balance |  |  | $ (61,755) |
Net change after income taxes | $ (4,595) | $ 1,461 | (2,070) | $ 2,252
Ending Balance | (63,825) |  | (63,825) |
PNMR and PNM [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning Balance |  |  | 28,008 | 25,748
Amounts reclassified from AOCI (pre-tax) |  |  | (12,537) | (8,857)
Income tax impact of amounts reclassified |  |  | 4,913 | 3,488
Other OCI changes (pre-tax) |  |  | 6,157 | 9,855
Income tax impact of other OCI changes |  |  | (2,413) | (3,809)
Net change after income taxes |  |  | (3,880) | 677
Ending Balance | 24,128 | 26,425 | 24,128 | 26,425
PNMR and PNM [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning Balance |  |  | (89,763) | (83,625)
Amounts reclassified from AOCI (pre-tax) |  |  | 2,976 | 2,576
Income tax impact of amounts reclassified |  |  | (1,166) | (1,016)
Net change after income taxes |  |  | 1,810 | 1,560
Ending Balance | (87,953) | (82,065) | (87,953) | (82,065)
PNM [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning Balance |  |  | (61,755) | (57,877)
Amounts reclassified from AOCI (pre-tax) |  |  | (9,561) | (6,281)
Income tax impact of amounts reclassified |  |  | 3,747 | 2,472
Other OCI changes (pre-tax) |  |  | 6,157 | 9,855
Income tax impact of other OCI changes |  |  | (2,413) | (3,809)
Net change after income taxes |  |  | (2,070) | 2,237
Ending Balance | (63,825) | (55,640) | (63,825) | (55,640)
Texas-New Mexico Power Company [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning Balance |  |  |  | (263)
Amounts reclassified from AOCI (pre-tax) |  |  |  | 176
Income tax impact of amounts reclassified |  |  |  | (61)
Other OCI changes (pre-tax) |  |  |  | (153)
Income tax impact of other OCI changes |  |  |  | 53
Net change after income taxes |  |  |  | 15
Ending Balance |  | (248) |  | (248)
PNMR [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning Balance |  |  | (61,755) | (58,140)
Amounts reclassified from AOCI (pre-tax) |  |  | (9,561) | (6,105)
Income tax impact of amounts reclassified |  |  | 3,747 | 2,411
Other OCI changes (pre-tax) |  |  | 6,157 | 9,702
Income tax impact of other OCI changes |  |  | (2,413) | (3,756)
Net change after income taxes |  |  | (2,070) | 2,252
Ending Balance | $ (63,825) | $ (55,888) | $ (63,825) | $ (55,888)

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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