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Pension and Other Postretirement Benefits - APBO, PBO, Fair Value of Plan Assets, and Funded Status of the Plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Non-current liability $ 100,375 $ 94,003  
Public Service Company of New Mexico      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Non-current liability 92,981 86,124  
Public Service Company of New Mexico | Pension Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 623,983 621,751  
Service cost 0 0 $ 0
Interest cost 24,270 26,908 30,307
Actuarial (gain) loss (41,025) 26,298  
Benefits paid (42,970) (50,974)  
Balance at end of year 564,258 623,983 621,751
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 562,016 543,601  
Actual return on plan assets (29,068) 69,389  
Employer contributions 0 0  
Fair value of plan assets at end of year 489,978 562,016 543,601
Funded status – asset (liability) for pension benefits (74,280) (61,967)  
Public Service Company of New Mexico | Other Postretirement Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 89,897 94,269  
Service cost 83 96 140
Interest cost 3,439 4,025 4,346
Participant contributions 2,390 3,069  
Actuarial (gain) loss (12,206) (1,601)  
Benefits paid (8,298) (9,961)  
Balance at end of year 75,305 89,897 94,269
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 80,356 72,694  
Actual return on plan assets (7,669) 14,222  
Employer contributions 2,924 332  
Fair value of plan assets at end of year 69,703 80,356 72,694
Funded status – asset (liability) for pension benefits (5,602) (9,541)  
Public Service Company of New Mexico | Executive Retirement Program      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 16,117 16,212  
Service cost 0 0 0
Interest cost 622 697 812
Actuarial (gain) loss (508) 674  
Benefits paid (1,505) (1,466)  
Balance at end of year 14,726 16,117 16,212
Less current liability 1,627 1,501  
Non-current liability 13,099 14,616  
Texas-New Mexico Power Company      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Non-current liability 7,394 7,879  
Texas-New Mexico Power Company | Pension Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 68,423 67,061  
Service cost 0 0 0
Interest cost 2,625 2,887 3,304
Actuarial (gain) loss (5,216) 3,050  
Benefits paid (5,245) (4,575)  
Balance at end of year 60,587 68,423 67,061
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 63,499 60,624  
Actual return on plan assets (3,180) 7,450  
Employer contributions 0 0  
Fair value of plan assets at end of year 55,074 63,499 60,624
Funded status – asset (liability) for pension benefits (5,513) (4,924)  
Texas-New Mexico Power Company | Other Postretirement Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 12,279 12,830  
Service cost 134 143 186
Interest cost 477 556 677
Participant contributions 174 379  
Actuarial (gain) loss (2,213) (381)  
Benefits paid (787) (1,248)  
Balance at end of year 10,064 12,279 12,830
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 10,002 8,544  
Actual return on plan assets (988) 1,642  
Employer contributions 343 685  
Fair value of plan assets at end of year 8,744 10,002 8,544
Funded status – asset (liability) for pension benefits (1,320) (2,277)  
Texas-New Mexico Power Company | Executive Retirement Program      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 771 787  
Service cost 0 0 0
Interest cost 29 33 40
Actuarial (gain) loss (4) 44  
Benefits paid (94) (93)  
Balance at end of year 702 771 $ 787
Less current liability 141 93  
Non-current liability $ 561 $ 678