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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, 2012
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 $ 171
Net actuarial (gain) loss - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year 134,088
Prior service cost (credit) - Experience loss (gain) 0
Net actuarial (gain) loss - Experience loss (gain) 82,734
Prior service cost (credit) - Regulatory asset (liability) adjustment (1)
Net actuarial (gain) loss - Regulatory asset (liability) adjustment (52,423)
Prior service cost (credit) - Amortization recognized in net periodic benefit cost (income) (138)
Net actuarial (gain) loss - Amortization recognized in net periodic benefit cost (income) (4,573)
Prior service cost (credit) - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year 32
Net actuarial (gain) loss - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year 159,826
Prior service cost (credit) - Amortization expected to be recognized in in 2013 (32)
Net actuarial (gain) loss - Amortization expected to be recognized in in 2013 (6,233)
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 (121)
Net actuarial (gain) loss - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year 960
Prior service cost (credit) - Experience loss (gain) 0
Net actuarial (gain) loss - Experience loss (gain) 623
Prior service cost (credit) - Regulatory asset (liability) adjustment 156
Net actuarial (gain) loss - Regulatory asset (liability) adjustment (1,683)
Prior service cost (credit) - Amortization recognized in net periodic benefit cost (income) (35)
Net actuarial (gain) loss - Amortization recognized in net periodic benefit cost (income) 100
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 2013 0
Net actuarial (gain) loss - Amortization expected to be recognized in in 2013 0
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 1,354
Net actuarial (gain) loss - Experience loss (gain) 1,895
Net actuarial (gain) loss - Regulatory asset (liability) adjustment (1,216)
Net actuarial (gain) loss - Amortization recognized in net periodic benefit cost (income) 36
Net actuarial (gain) loss - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year 2,069
Net actuarial (gain) loss - Amortization expected to be recognized in in 2013 (98)
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 0
Net actuarial (gain) loss - Experience loss (gain) 9,807
Net actuarial (gain) loss - Regulatory asset (liability) adjustment (9,807)
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 2013 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 0
Net actuarial (gain) loss - Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year 0
Prior service cost (credit) - Experience loss (gain) 0
Net actuarial (gain) loss - Experience loss (gain) 1,985
Prior service cost (credit) - Regulatory asset (liability) adjustment 0
Net actuarial (gain) loss - Regulatory asset (liability) adjustment (1,985)
Prior service cost (credit) - Amortization recognized in net periodic benefit cost (income) 0
Net actuarial (gain) loss - Amortization recognized in net periodic benefit cost (income)   
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 2013 0
Net actuarial (gain) loss - Amortization expected to be recognized in in 2013 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) 107
Net actuarial (gain) loss - Regulatory asset (liability) adjustment (107)
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 2013 $ 0