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Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Equity [Abstract] |  |  |  |
Percentage of Pension Liability Adjustment Capitalized into Construction Work In Process |  |  | 23.00% | 16.40%
Percentage of Pension Liability Adjustment Capitalized into Other Accounts |  |  | 2.10% | 2.50%
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning Balance |  |  | $ (58,140) | $ (81,630)
Amounts reclassified from AOCI (pre-tax) |  |  | (6,105) | (3,573)
Income tax impact of amounts reclassified |  |  | 2,411 | 1,417
Other OCI changes (pre-tax) |  |  | 9,702 | 8,594
Income tax impact of other OCI changes |  |  | (3,756) | (3,402)
Net change after income taxes | 1,461 | (1,903) | 2,252 | 3,036
Ending Balance | (55,888) | (78,594) | (55,888) | (78,594)
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning Balance |  |  | 25,748 | 16,406
Amounts reclassified from AOCI (pre-tax) |  |  | (8,857) | (6,854)
Income tax impact of amounts reclassified |  |  | 3,488 | 2,714
Other OCI changes (pre-tax) |  |  | 9,855 | 8,591
Income tax impact of other OCI changes |  |  | (3,809) | (3,401)
Net change after income taxes |  |  | 677 | 1,050
Ending Balance | 26,425 | 17,456 | 26,425 | 17,456
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning Balance |  |  | (83,625) | (97,820)
Amounts reclassified from AOCI (pre-tax) |  |  | 2,576 | 3,182
Income tax impact of amounts reclassified |  |  | (1,016) | (1,262)
Other OCI changes (pre-tax) |  |  |  |
Income tax impact of other OCI changes |  |  |  |
Net change after income taxes |  |  | 1,560 | 1,920
Ending Balance | (82,065) | (95,900) | (82,065) | (95,900)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning Balance |  |  | (263) | (216)
Amounts reclassified from AOCI (pre-tax) |  |  | 176 | 99
Income tax impact of amounts reclassified |  |  | (61) | (35)
Other OCI changes (pre-tax) |  |  | (153) | 3
Income tax impact of other OCI changes |  |  | 53 | (1)
Net change after income taxes |  |  | 15 | 66
Ending Balance | (248) | (150) | (248) | (150)
Public Service Company of New Mexico [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning Balance |  |  | (57,877) | (81,414)
Amounts reclassified from AOCI (pre-tax) |  |  | (6,281) | (3,672)
Income tax impact of amounts reclassified |  |  | 2,472 | 1,452
Other OCI changes (pre-tax) |  |  | 9,855 | 8,591
Income tax impact of other OCI changes |  |  | (3,809) | (3,401)
Net change after income taxes | 1,382 | (1,930) | 2,237 | 2,970
Ending Balance | (55,640) | (78,444) | (55,640) | (78,444)
Public Service Company of New Mexico [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning Balance |  |  | 25,748 | 16,406
Amounts reclassified from AOCI (pre-tax) |  |  | (8,857) | (6,854)
Income tax impact of amounts reclassified |  |  | 3,488 | 2,714
Other OCI changes (pre-tax) |  |  | 9,855 | 8,591
Income tax impact of other OCI changes |  |  | (3,809) | (3,401)
Net change after income taxes |  |  | 677 | 1,050
Ending Balance | 26,425 | 17,456 | 26,425 | 17,456
Public Service Company of New Mexico [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning Balance |  |  | (83,625) | (97,820)
Amounts reclassified from AOCI (pre-tax) |  |  | 2,576 | 3,182
Income tax impact of amounts reclassified |  |  | (1,016) | (1,262)
Other OCI changes (pre-tax) |  |  |  |
Income tax impact of other OCI changes |  |  |  |
Net change after income taxes |  |  | 1,560 | 1,920
Ending Balance | (82,065) | (95,900) | (82,065) | (95,900)
Public Service Company of New Mexico [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning Balance |  |  |  |
Amounts reclassified from AOCI (pre-tax) |  |  |  |
Income tax impact of amounts reclassified |  |  |  |
Other OCI changes (pre-tax) |  |  |  |
Income tax impact of other OCI changes |  |  |  |
Net change after income taxes |  |  |  |
Ending Balance |  |  |  |
Texas-New Mexico Power Company [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning Balance |  |  | (263) | (216)
Amounts reclassified from AOCI (pre-tax) |  |  | 176 | 99
Income tax impact of amounts reclassified |  |  | (61) | (35)
Other OCI changes (pre-tax) |  |  | (153) | 3
Income tax impact of other OCI changes |  |  | 53 | (1)
Net change after income taxes | 79 | 27 | 15 | 66
Ending Balance | (248) | (150) | (248) | (150)
Texas-New Mexico Power Company [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning Balance |  |  |  |
Amounts reclassified from AOCI (pre-tax) |  |  |  |
Income tax impact of amounts reclassified |  |  |  |
Other OCI changes (pre-tax) |  |  |  |
Income tax impact of other OCI changes |  |  |  |
Net change after income taxes |  |  |  |
Ending Balance |  |  |  |
Texas-New Mexico Power Company [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning Balance |  |  |  |
Amounts reclassified from AOCI (pre-tax) |  |  |  |
Income tax impact of amounts reclassified |  |  |  |
Other OCI changes (pre-tax) |  |  |  |
Income tax impact of other OCI changes |  |  |  |
Net change after income taxes |  |  |  |
Ending Balance |  |  |  |
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) | (216)
Amounts reclassified from AOCI (pre-tax) |  |  | 176 | 99
Income tax impact of amounts reclassified |  |  | (61) | (35)
Other OCI changes (pre-tax) |  |  | (153) | 3
Income tax impact of other OCI changes |  |  | 53 | (1)
Net change after income taxes |  |  | 15 | 66
Ending Balance | $ (248) | $ (150) | $ (248) | $ (150)

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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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