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Pension and Other Postretirement Benefits - Pre-Tax Information about Prior Service Cost and Net Actuarial (Gain) loss in AOCI (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Public Service Company of New Mexico | Pension Plan  
Prior service cost  
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year $ (1,450)
Experience (gain) loss 0
Regulatory asset (liability) adjustment 0
Amortization recognized in net periodic benefit cost (income) 405
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year (1,045)
Amortization expected to be recognized in 2018 (405)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax [Abstract]  
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year 159,149
Experience (gain) loss (9,288)
Regulatory asset (liability) adjustment 5,387
Amortization recognized in net periodic benefit cost (income) (6,722)
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year 148,526
Amortization expected to be recognized in 2018 6,653
Public Service Company of New Mexico | Executive Retirement Program  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax [Abstract]  
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year 2,299
Experience (gain) loss 674
Regulatory asset (liability) adjustment (391)
Amortization recognized in net periodic benefit cost (income) (132)
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year 2,450
Amortization expected to be recognized in 2018 151
Texas-New Mexico Power Company | Pension Plan  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax [Abstract]  
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year 0
Experience (gain) loss (621)
Regulatory asset (liability) adjustment 621
Amortization recognized in net periodic benefit cost (income) 0
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year 0
Amortization expected to be recognized in 2018 0
Texas-New Mexico Power Company | Executive Retirement Program  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax [Abstract]  
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year 0
Experience (gain) loss 44
Regulatory asset (liability) adjustment (44)
Amortization recognized in net periodic benefit cost (income) 0
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year 0
Amortization expected to be recognized in 2018 $ 0