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Pension and Other Postretirement Benefit Plans Pre-Tax Information about Prior Service Cost and Net Actuarial (Gain) loss in AOCI (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Public Service Company of New Mexico [Member] | Pension Plan [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Prior service cost (credit) - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year $ 314
Net actuarial (gain) loss - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year 133,153
Prior service cost (credit) - Experience loss (gain) 0
Net actuarial (gain) loss - Experience loss (gain) 6,601
Prior service cost (credit) - Regulatory asset (liability) adjustment (3)
Net actuarial (gain) loss - Regulatory asset (liability) adjustment (1,592)
Prior service cost (credit) - Amortization recognized in net periodic benefit cost (income) (140)
Net actuarial (gain) loss - Amortization recognized in net periodic benefit cost (income) (4,074)
Prior service cost (credit) - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year 171
Net actuarial (gain) loss - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year 134,088
Prior service cost (credit) - Amortization expected to be recognized in in 2012 (138)
Net actuarial (gain) loss - Amortization expected to be recognized in in 2012 (4,573)
Public Service Company of New Mexico [Member] | Other Postretirement Benefits [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Prior service cost (credit) - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year (882)
Net actuarial (gain) loss - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year 3,187
Prior service cost (credit) - Experience loss (gain) (1,505)
Net actuarial (gain) loss - Experience loss (gain) 3,837
Prior service cost (credit) - Regulatory asset (liability) adjustment 2,164
Net actuarial (gain) loss - Regulatory asset (liability) adjustment (5,940)
Prior service cost (credit) - Amortization recognized in net periodic benefit cost (income) 102
Net actuarial (gain) loss - Amortization recognized in net periodic benefit cost (income) (124)
Prior service cost (credit) - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year (121)
Net actuarial (gain) loss - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year 960
Prior service cost (credit) - Amortization expected to be recognized in in 2012 (35)
Net actuarial (gain) loss - Amortization expected to be recognized in in 2012 100
Public Service Company of New Mexico [Member] | Executive Retirement Program [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Net actuarial (gain) loss - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year 1,588
Net actuarial (gain) loss - Experience loss (gain) (252)
Net actuarial (gain) loss - Regulatory asset (liability) adjustment 59
Net actuarial (gain) loss - Amortization recognized in net periodic benefit cost (income) (41)
Net actuarial (gain) loss - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year 1,354
Net actuarial (gain) loss - Amortization expected to be recognized in in 2012 (36)
Texas-New Mexico Power Company [Member] | Pension Plan [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Net actuarial (gain) loss - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year 521
Net actuarial (gain) loss - Experience loss (gain) 1,863
Net actuarial (gain) loss - Regulatory asset (liability) adjustment (1,358)
Net actuarial (gain) loss - Amortization recognized in net periodic benefit cost (income) 16
Net actuarial (gain) loss - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year 0
Net actuarial (gain) loss - Amortization expected to be recognized in in 2012 0
Texas-New Mexico Power Company [Member] | Other Postretirement Benefits [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Prior service cost (credit) - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year 12
Net actuarial (gain) loss - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year (110)
Prior service cost (credit) - Experience loss (gain) 0
Net actuarial (gain) loss - Experience loss (gain) (431)
Prior service cost (credit) - Regulatory asset (liability) adjustment (11)
Net actuarial (gain) loss - Regulatory asset (liability) adjustment 537
Prior service cost (credit) - Amortization recognized in net periodic benefit cost (income) (1)
Net actuarial (gain) loss - Amortization recognized in net periodic benefit cost (income) 4
Prior service cost (credit) - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year 0
Net actuarial (gain) loss - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year 0
Prior service cost (credit) - Amortization expected to be recognized in in 2012 0
Net actuarial (gain) loss - Amortization expected to be recognized in in 2012 0
Texas-New Mexico Power Company [Member] | Executive Retirement Program [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Net actuarial (gain) loss - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year 0
Net actuarial (gain) loss - Experience loss (gain) 8
Net actuarial (gain) loss - Regulatory asset (liability) adjustment (8)
Net actuarial (gain) loss - Amortization recognized in net periodic benefit cost (income) 0
Net actuarial (gain) loss - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year 0
Net actuarial (gain) loss - Amortization expected to be recognized in in 2012 $ 0