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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Unrealized holding gains (losses) arising during the period, income tax (expense) $ (4,143) $ (4,972) $ (7,544) $ (15,409)
Reclassification adjustment for (gains) included in net earnings (loss), income tax expense 925 4,248 3,639 12,786
Pension liability adjustment, income tax (expense) benefit (631) (476) (1,893) (1,428)
Change in fair market value, income tax (expense) 128 51 127 150
Reclassification adjustment for (gains) losses included in net earnings (loss), income tax expense (benefit) (19) (16) (54) (47)
Public Service Company of New Mexico [Member]
        
Unrealized holding gains (losses) arising during the period, income tax (expense) (4,143) (4,972) (7,544) (15,409)
Reclassification adjustment for (gains) included in net earnings (loss), income tax expense 925 4,248 3,639 12,786
Pension liability adjustment, income tax (expense) benefit (631) (476) (1,893) (1,428)
Texas-New Mexico Power Company [Member]
        
Change in fair market value, income tax (expense) 128 51 127 150
Reclassification adjustment for (gains) losses included in net earnings (loss), income tax expense (benefit) $ (19) $ (16) $ (54) $ (47)