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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Unrealized holding gains (losses) arising during the period, income tax benefit (expense) $ 1,200 $ (137) $ (1,213) $ (3,946)
Reclassification adjustment for (gains) included in net earnings (loss), income tax expense (benefit) 3,925 1,059 8,838 4,547
Pension liability adjustment, income tax (expense) benefit (583) (508) (1,749) (1,524)
Change in fair market value, income tax benefit (expense) 276 0 276 53
Reclassification adjustment for (gains) losses included in net earnings (loss), income tax expense (benefit) 0 3 0 (58)
Public Service Company of New Mexico [Member]        
Unrealized holding gains (losses) arising during the period, income tax benefit (expense) 1,200 (137) (1,213) (3,946)
Reclassification adjustment for (gains) included in net earnings (loss), income tax expense (benefit) 3,925 1,059 8,838 4,547
Pension liability adjustment, income tax (expense) benefit (583) (508) (1,749) (1,524)
Texas-New Mexico Power Company [Member]        
Change in fair market value, income tax benefit (expense) 0 0 0 53
Reclassification adjustment for (gains) losses included in net earnings (loss), income tax expense (benefit) $ 0 $ 3 $ 0 $ (58)