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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Public Service Company of New Mexico | Pension Plan    
Components of Net Periodic Benefit Cost    
Service cost $ 0 $ 0
Interest cost 6,727,000 7,577,000
Expected return on plan assets (8,451,000) (8,854,000)
Amortization of net (gain) loss 4,001,000 3,455,000
Amortization of prior service cost (241,000) (241,000)
Net Periodic Benefit Cost (Income) 2,036,000 1,937,000
Contributions by employer 0 0
Total expected employer contributions for future fiscal years $ 0  
Public Service Company of New Mexico | Pension Plan | Minimum    
Components of Net Periodic Benefit Cost    
Assumptions used calculating net periodic benefit cost, discount rate 4.10%  
Public Service Company of New Mexico | Pension Plan | Maximum    
Components of Net Periodic Benefit Cost    
Assumptions used calculating net periodic benefit cost, discount rate 4.90%  
Public Service Company of New Mexico | OPEB Plan    
Components of Net Periodic Benefit Cost    
Service cost $ 24,000 35,000
Interest cost 1,006,000 1,087,000
Expected return on plan assets (1,308,000) (1,371,000)
Amortization of net (gain) loss 921,000 286,000
Amortization of prior service cost (416,000) (7,000)
Net Periodic Benefit Cost (Income) 227,000 30,000
Contributions by employer 0 800,000
Total expected employer contributions for future fiscal years 0  
Public Service Company of New Mexico | Executive Retirement Program    
Components of Net Periodic Benefit Cost    
Service cost 0 0
Interest cost 174,000 203,000
Expected return on plan assets 0 0
Amortization of net (gain) loss 78,000 64,000
Amortization of prior service cost 0 0
Net Periodic Benefit Cost (Income) 252,000 267,000
Contributions by employer 500,000 500,000
Total expected employer contributions for future fiscal years 5,800,000  
Total expected employer contributions for fiscal year 1,500,000  
Texas-New Mexico Power Company | Pension Plan    
Components of Net Periodic Benefit Cost    
Service cost 0 0
Interest cost 722,000 826,000
Expected return on plan assets (945,000) (986,000)
Amortization of net (gain) loss 231,000 175,000
Amortization of prior service cost 0 0
Net Periodic Benefit Cost (Income) 8,000 15,000
Contributions by employer 0 0
Total expected employer contributions for future fiscal years $ 0  
Texas-New Mexico Power Company | Pension Plan | Minimum    
Components of Net Periodic Benefit Cost    
Assumptions used calculating net periodic benefit cost, discount rate 4.10%  
Texas-New Mexico Power Company | Pension Plan | Maximum    
Components of Net Periodic Benefit Cost    
Assumptions used calculating net periodic benefit cost, discount rate 4.90%  
Texas-New Mexico Power Company | OPEB Plan    
Components of Net Periodic Benefit Cost    
Service cost $ 36,000 46,000
Interest cost 139,000 169,000
Expected return on plan assets (114,000) (122,000)
Amortization of net (gain) loss (20,000) (10,000)
Amortization of prior service cost 0 0
Net Periodic Benefit Cost (Income) 41,000 83,000
Contributions by employer 700,000 0
Total expected employer contributions for future fiscal years 1,400,000  
Total expected employer contributions for fiscal year 0  
Texas-New Mexico Power Company | Executive Retirement Program    
Components of Net Periodic Benefit Cost    
Service cost 0 0
Interest cost 8,000 10,000
Expected return on plan assets 0 0
Amortization of net (gain) loss 2,000 1,000
Amortization of prior service cost 0 0
Net Periodic Benefit Cost (Income) 10,000 $ 11,000
Total expected employer contributions for future fiscal years 400,000  
Total expected employer contributions for fiscal year 100,000  
Texas-New Mexico Power Company | Executive Retirement Program | Maximum    
Components of Net Periodic Benefit Cost    
Contributions by employer $ 100,000.0