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Income Taxes Schedule of Components of Income Tax Expense (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Taxes [Line Items]      
Current federal income tax $ (1,296) $ 1,319 $ (52,184)
Current state income tax (37) (4,208) (15,528)
Deferred federal income tax 50,851 119,280 28,364
Deferred state income tax 6,921 7,462 9,522
Investment tax credit earned and deferred 708 0 0
Amortization of accumulated investment tax credits (2,237) (2,318) (2,429)
Total income taxes (benefit) 54,910 121,535 (32,255)
Public Service Company of New Mexico [Member]
      
Income Taxes [Line Items]      
Current federal income tax (12,951) (46,364) (77,691)
Current state income tax (1,815) (6,776) 438
Deferred federal income tax 55,486 78,673 109,170
Deferred state income tax 11,522 14,212 6,939
Investment tax credit earned and deferred 708 0 0
Amortization of accumulated investment tax credits (2,237) (2,318) (2,429)
Total income taxes (benefit) 50,713 37,427 36,427
Texas-New Mexico Power Company [Member]
      
Income Taxes [Line Items]      
Current federal income tax 9,152 (3,578) 3,532
Current state income tax 1,822 1,981 1,766
Deferred federal income tax 4,406 15,507 4,775
Deferred state income tax (28) (29) (29)
Total income taxes (benefit) $ 15,352 $ 13,881 $ 10,044