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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, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Unrealized holding gains (losses) arising during the period, income tax (expense) $ (4,972) $ 1,123 $ (15,409) $ (8,157)
Reclassification adjustment for (gains) included in net earnings (loss), income tax expense 4,248 1,593 12,789 11,555
Changes in unrecognized amounts of pension and postretirement benefits, income tax (expense) benefit (476) (425) (1,428) 176
Change in fair market value, income tax (expense) 51 123 150 441
Reclassification adjustment for (gains) losses included in net earnings (loss), income tax expense (benefit) (16) (827) (47) (1,129)
Public Service Company of New Mexico [Member]
        
Unrealized holding gains (losses) arising during the period, income tax (expense) (4,972) 1,123 (15,409) (8,157)
Reclassification adjustment for (gains) included in net earnings (loss), income tax expense 4,248 1,593 12,786 11,555
Changes in unrecognized amounts of pension and postretirement benefits, income tax (expense) benefit (476) (423) (1,428) 9
Reclassification adjustment for (gains) losses included in net earnings (loss), income tax expense (benefit) 0 0 0 (11)
Texas-New Mexico Power Company [Member]
        
Changes in unrecognized amounts of pension and postretirement benefits, income tax (expense) benefit 0 (1) 0 169
Change in fair market value, income tax (expense) 51 110 150 382
Reclassification adjustment for (gains) losses included in net earnings (loss), income tax expense (benefit) $ (16) $ (850) $ (47) $ (1,052)