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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Public Service Company of New Mexico [Member] | Pension Plan [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 7,064 7,541 14,127 15,082
Expected return on plan assets (9,831) (9,511) (19,662) (19,022)
Amortization of net (gain) loss 3,705 3,255 7,410 6,510
Amortization of prior service cost (241) (241) (483) (483)
Net Periodic Benefit Cost (Income) 697 1,044 1,392 2,087
Defined Benefit Plan, Contributions by Employer 0 0 30,000 0
Defined Benefit Plan Total Expected Employer Contributions for Fiscal Year 0   0  
Defined Benefit Plan, Estimated Future Employer Contributions After Current Fiscal Year 22,000   $ 22,000  
Public Service Company of New Mexico [Member] | Pension Plan [Member] | Minimum [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate (as a percent)     4.80%  
Public Service Company of New Mexico [Member] | Pension Plan [Member] | Maximum [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate (as a percent)     5.50%  
Public Service Company of New Mexico [Member] | OPEB [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 51 45 $ 102 91
Interest cost 1,023 1,159 2,045 2,315
Expected return on plan assets (1,403) (1,410) (2,805) (2,819)
Amortization of net (gain) loss 491 556 983 1,113
Amortization of prior service cost (160) (336) (321) (672)
Net Periodic Benefit Cost (Income) 2 14 4 28
Defined Benefit Plan, Contributions by Employer 800 800 1,600 1,600
Defined Benefit Plan Total Expected Employer Contributions for Fiscal Year 3,500   3,500  
Defined Benefit Plan, Estimated Future Employer Contributions After Current Fiscal Year 14,000   14,000  
Public Service Company of New Mexico [Member] | Other Pension Plan [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 0 0 0 0
Interest cost 190 205 380 411
Expected return on plan assets 0 0 0 0
Amortization of net (gain) loss 81 52 162 105
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) 271 257 542 516
Defined Benefit Plan, Contributions by Employer 400 400 900 700
Defined Benefit Plan Total Expected Employer Contributions for Fiscal Year 1,500   1,500  
Texas-New Mexico Power Company [Member] | Pension Plan [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 0 0 0 0
Interest cost 761 798 1,521 1,597
Expected return on plan assets (1,105) (1,132) (2,210) (2,263)
Amortization of net (gain) loss 195 166 391 333
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) (149) (168) (298) (333)
Defined Benefit Plan, Contributions by Employer 0 0 0 0
Defined Benefit Plan Total Expected Employer Contributions for Fiscal Year 0   0  
Defined Benefit Plan, Estimated Future Employer Contributions After Current Fiscal Year $ 0   0  
Texas-New Mexico Power Company [Member] | Pension Plan [Member] | Minimum [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate (as a percent) 4.80%      
Texas-New Mexico Power Company [Member] | Pension Plan [Member] | Maximum [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate (as a percent) 5.50%      
Texas-New Mexico Power Company [Member] | OPEB [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost $ 62 59 124 119
Interest cost 152 155 304 309
Expected return on plan assets (130) (133) (260) (267)
Amortization of net (gain) loss 0 (31) 0 (61)
Amortization of prior service cost 0 8 0 16
Net Periodic Benefit Cost (Income) 84 58 168 116
Defined Benefit Plan, Contributions by Employer 0 300 0 300
Defined Benefit Plan Total Expected Employer Contributions for Fiscal Year 300   300  
Defined Benefit Plan, Estimated Future Employer Contributions After Current Fiscal Year 1,400   1,400  
Texas-New Mexico Power Company [Member] | Other Pension Plan [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 0 0 0 0
Interest cost 9 10 18 20
Expected return on plan assets 0 0 0 0
Amortization of net (gain) loss 1 0 2 0
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) 10 10 20 20
Defined Benefit Plan Total Expected Employer Contributions for Fiscal Year 100   100  
Texas-New Mexico Power Company [Member] | Other Pension Plan [Member] | Maximum [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Defined Benefit Plan, Contributions by Employer $ 100 $ 100 $ 100 $ 100