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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Unrealized holding gains (losses) arising during the period, income tax (expense) $ (10,855) $ (15,262) $ (13,577)
Reclassification adjustment for (gains) included in net earnings (loss), income tax expense 4,734 14,755 13,956
Experience gain (loss), income tax (expense) benefit (6,781) 11,910 1,187
Reclassification adjustment for amortization of experience (gain) loss recognized as net periodic benefit cost, income tax (expense) benefit (2,524) (1,825) (1,699)
Change in fair market value, income tax (expense) 98 153 349
Reclassification adjustment for (gains) losses included in net earnings (loss), income tax expense (benefit) (73) (65) (1,230)
Public Service Company of New Mexico [Member]
      
Unrealized holding gains (losses) arising during the period, income tax (expense) (10,855) (15,262) (13,577)
Reclassification adjustment for (gains) included in net earnings (loss), income tax expense 4,734 14,755 13,956
Experience gain (loss), income tax (expense) benefit (6,781) 11,910 1,334
Reclassification adjustment for amortization of experience (gain) loss recognized as net periodic benefit cost, income tax (expense) benefit (2,524) (1,825) (1,694)
Change in fair market value, income tax (expense) 0 0 0
Reclassification adjustment for (gains) losses included in net earnings (loss), income tax expense (benefit) 0 0 (11)
Texas-New Mexico Power Company [Member]
      
Experience gain (loss), income tax (expense) benefit 0 0 (147)
Reclassification adjustment for amortization of experience (gain) loss recognized as net periodic benefit cost, income tax (expense) benefit 0 0 (5)
Change in fair market value, income tax (expense) 98 153 430
Reclassification adjustment for (gains) losses included in net earnings (loss), income tax expense (benefit) $ (73) $ (65) $ (1,068)