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Pension and Other Postretirement Benefits Components of Net Periodic Benefit Cost (Income) Recognized (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Public Service Company of New Mexico [Member] | Pension Plan [Member]
      
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Service cost $ 0 $ 0 $ 0
Interest cost 28,142 32,232 32,804
Expected return on plan assets (41,930) (41,301) (37,075)
Amortization of net (gain) loss 14,840 10,516 9,209
Amortization of prior service cost (credit) 76 317 317
Net periodic benefit cost 1,128 1,764 5,255
Public Service Company of New Mexico [Member] | Executive Retirement Program [Member]
      
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Service cost 0 0 0
Interest cost 720 876 930
Amortization of net (gain) loss 232 83 93
Amortization of prior service cost (credit) 0 0 0
Net periodic benefit cost 952 959 1,023
Public Service Company of New Mexico [Member] | Other Postretirement Benefits [Member]
      
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Service cost 260 217 259
Interest cost 4,113 5,293 5,378
Expected return on plan assets (5,043) (4,901) (5,388)
Amortization of net (gain) loss 4,242 3,888 3,205
Amortization of prior service cost (credit) (1,343) (1,343) (2,648)
Net periodic benefit cost 2,229 3,154 806
Texas-New Mexico Power Company [Member] | Pension Plan [Member]
      
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Service cost 0 0 0
Interest cost 3,087 3,635 3,800
Expected return on plan assets (4,849) (5,324) (5,470)
Amortization of net (gain) loss 1,049 462 346
Amortization of prior service cost (credit) 0 0 0
Net periodic benefit cost (713) (1,227) (1,324)
Texas-New Mexico Power Company [Member] | Executive Retirement Program [Member]
      
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Service cost 0 0 0
Interest cost 36 45 46
Amortization of net (gain) loss 0 0 0
Amortization of prior service cost (credit) 0 0 0
Net periodic benefit cost 36 45 46
Texas-New Mexico Power Company [Member] | Other Postretirement Benefits [Member]
      
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Service cost 299 244 306
Interest cost 566 624 654
Expected return on plan assets (503) (516) (533)
Amortization of net (gain) loss 0 (209) (193)
Amortization of prior service cost (credit) 57 57 60
Net periodic benefit cost $ 419 $ 200 $ 294