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Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Taxes [Line Items]      
Federal income tax at statutory rates $ 61,262 $ 109,364 $ (22,183)
First Choice goodwill 0 15,055 0
Investment tax credits (2,237) (2,318) (2,429)
Flow-through of depreciation items 1,284 3,659 3,995
Earnings attributable to non-controlling interest in Valencia (4,918) (4,917) (4,747)
State income tax 4,646 3,395 (6,312)
Other (5,127) (2,703) (579)
Total income taxes (benefit) 54,910 121,535 (32,255)
Effective tax rate 31.37% 38.90% 50.89%
Public Service Company of New Mexico [Member]
      
Income Taxes [Line Items]      
Federal income tax at statutory rates 54,710 37,088 37,551
Investment tax credits (2,237) (2,318) (2,429)
Flow-through of depreciation items 1,268 3,656 3,994
Earnings attributable to non-controlling interest in Valencia (4,918) (4,917) (4,747)
State income tax 6,500 4,797 4,747
Other (4,610) (879) (2,689)
Total income taxes (benefit) 50,713 37,427 36,427
Effective tax rate 32.44% 35.32% 33.95%
Texas-New Mexico Power Company [Member]
      
Income Taxes [Line Items]      
Federal income tax at statutory rates 14,735 12,648 9,109
State income tax 1,185 1,288 1,148
Other (568) (55) (213)
Total income taxes (benefit) $ 15,352 $ 13,881 $ 10,044
Effective tax rate 36.47% 38.41% 38.59%