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Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning Balance | $ (81,630) | $ (66,856) | $ (68,666)
Amounts reclassified from AOCI (pre-tax) | (5,385) | (32,476) | (27,511)
Income tax impact of amounts reclassified | 2,137 | 12,865 | 11,027
Other OCI changes (pre-tax) | 44,276 | 8,036 | 30,335
Income tax impact of other OCI changes | (17,538) | (3,199) | (12,041)
Total Other Comprehensive Income (Loss) | 23,490 | (14,774) | 1,810
Ending Balance | (58,140) | (81,630) | (66,856)
Percentage of Pension Liability Adjustment Capitalized into Construction Work In Process | 18.70% |  |
Percentage of Pension Liability Adjustment Capitalized into Other Accounts | 3.00% |  |
Public Service Company of New Mexico [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning Balance | (81,414) | (66,798) | (66,786)
Amounts reclassified from AOCI (pre-tax) | (5,592) | (32,658) | (30,946)
Income tax impact of amounts reclassified | 2,210 | 12,930 | 12,251
Other OCI changes (pre-tax) | 44,555 | 8,464 | 30,926
Income tax impact of other OCI changes | (17,636) | (3,352) | (12,243)
Total Other Comprehensive Income (Loss) | 23,537 | (14,616) | (12)
Ending Balance | (57,877) | (81,414) | (66,798)
Texas-New Mexico Power Company [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning Balance | (216) | (58) | (1,485)
Amounts reclassified from AOCI (pre-tax) | 207 | 182 | 3,010
Income tax impact of amounts reclassified | (73) | (65) | (1,073)
Other OCI changes (pre-tax) | (279) | (428) | (793)
Income tax impact of other OCI changes | 98 | 153 | 283
Total Other Comprehensive Income (Loss) | (47) | (158) | 1,427
Ending Balance | (263) | (216) | (58)
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning Balance | 16,406 | 15,634 | 16,211
Amounts reclassified from AOCI (pre-tax) | (11,956) | (37,269) | (35,251)
Income tax impact of amounts reclassified | 4,734 | 14,755 | 13,956
Other OCI changes (pre-tax) | 27,419 | 38,548 | 34,295
Income tax impact of other OCI changes | (10,855) | (15,262) | (13,577)
Total Other Comprehensive Income (Loss) | 9,342 | 772 | (577)
Ending Balance | 25,748 | 16,406 | 15,634
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Public Service Company of New Mexico [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning Balance | 16,406 | 15,634 | 16,211
Amounts reclassified from AOCI (pre-tax) | (11,956) | (37,269) | (35,251)
Income tax impact of amounts reclassified | 4,734 | 14,755 | 13,956
Other OCI changes (pre-tax) | 27,419 | 38,548 | 34,295
Income tax impact of other OCI changes | (10,855) | (15,262) | (13,577)
Total Other Comprehensive Income (Loss) | 9,342 | 772 | (577)
Ending Balance | 25,748 | 16,406 | 15,634
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Texas-New Mexico Power Company [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning Balance | 0 | 0 | 0
Amounts reclassified from AOCI (pre-tax) | 0 | 0 | 0
Income tax impact of amounts reclassified | 0 | 0 | 0
Other OCI changes (pre-tax) | 0 | 0 | 0
Income tax impact of other OCI changes | 0 | 0 | 0
Total Other Comprehensive Income (Loss) | 0 | 0 | 0
Ending Balance | 0 | 0 | 0
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning Balance | (97,820) | (82,432) | (83,254)
Amounts reclassified from AOCI (pre-tax) | 6,364 | 4,611 | 4,292
Income tax impact of amounts reclassified | (2,524) | (1,825) | (1,699)
Other OCI changes (pre-tax) | 17,136 | (30,084) | (2,958)
Income tax impact of other OCI changes | (6,781) | 11,910 | 1,187
Total Other Comprehensive Income (Loss) | 14,195 | (15,388) | 822
Ending Balance | (83,625) | (97,820) | (82,432)
Accumulated Defined Benefit Plans Adjustment [Member] | Public Service Company of New Mexico [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning Balance | (97,820) | (82,432) | (82,981)
Amounts reclassified from AOCI (pre-tax) | 6,364 | 4,611 | 4,278
Income tax impact of amounts reclassified | (2,524) | (1,825) | (1,694)
Other OCI changes (pre-tax) | 17,136 | (30,084) | (3,369)
Income tax impact of other OCI changes | (6,781) | 11,910 | 1,334
Total Other Comprehensive Income (Loss) | 14,195 | (15,388) | 549
Ending Balance | (83,625) | (97,820) | (82,432)
Accumulated Defined Benefit Plans Adjustment [Member] | Texas-New Mexico Power Company [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning Balance | 0 | 0 | (275)
Amounts reclassified from AOCI (pre-tax) | 0 | 0 | 13
Income tax impact of amounts reclassified | 0 | 0 | (5)
Other OCI changes (pre-tax) | 0 | 0 | 414
Income tax impact of other OCI changes | 0 | 0 | (147)
Total Other Comprehensive Income (Loss) | 0 | 0 | 275
Ending Balance | 0 | 0 | 0
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning Balance | (216) | (58) | (1,623)
Amounts reclassified from AOCI (pre-tax) | 207 | 182 | 3,448
Income tax impact of amounts reclassified | (73) | (65) | (1,230)
Other OCI changes (pre-tax) | (279) | (428) | (1,002)
Income tax impact of other OCI changes | 98 | 153 | 349
Total Other Comprehensive Income (Loss) | (47) | (158) | 1,565
Ending Balance | (263) | (216) | (58)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Public Service Company of New Mexico [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning Balance | 0 | 0 | (16)
Amounts reclassified from AOCI (pre-tax) | 0 | 0 | 27
Income tax impact of amounts reclassified | 0 | 0 | (11)
Other OCI changes (pre-tax) | 0 | 0 | 0
Income tax impact of other OCI changes | 0 | 0 | 0
Total Other Comprehensive Income (Loss) | 0 | 0 | 16
Ending Balance | 0 | 0 | 0
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Texas-New Mexico Power Company [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning Balance | (216) | (58) | (1,210)
Amounts reclassified from AOCI (pre-tax) | 207 | 182 | 2,997
Income tax impact of amounts reclassified | (73) | (65) | (1,068)
Other OCI changes (pre-tax) | (279) | (428) | (1,207)
Income tax impact of other OCI changes | 98 | 153 | 430
Total Other Comprehensive Income (Loss) | (47) | (158) | 1,152
Ending Balance | $ (263) | $ (216) | $ (58)

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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 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: 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=28358780&loc=d3e637-108580 Reference 3: 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=28358780&loc=d3e681-108580 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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