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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Unrealized holding gains (losses) arising during the period, income tax (expense) $ (3,111) $ (7,415)
Reclassification adjustment for (gains) included in net earnings (loss), income tax expense (631) (476)
Pension liability adjustment, income tax (expense) benefit 960 727
Change in fair market value, income tax (expense) (4) 59
Reclassification adjustment for (gains) losses included in net earnings (loss), income tax expense (benefit) (17) (15)
Public Service Company of New Mexico [Member]
    
Unrealized holding gains (losses) arising during the period, income tax (expense) (3,111) (7,415)
Reclassification adjustment for (gains) included in net earnings (loss), income tax expense 529 3,546
Pension liability adjustment, income tax (expense) benefit (631) (476)
Texas-New Mexico Power Company [Member]
    
Change in fair market value, income tax (expense) (4) 59
Reclassification adjustment for (gains) losses included in net earnings (loss), income tax expense (benefit) $ (17) $ (15)