XML 71 R51.htm IDEA: XBRL DOCUMENT v3.5.0.2
Pension and Other Postretirement Benefit Plans (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Public Service Company of New Mexico [Member] | Pension Plan [Member]          
Components of Net Periodic Benefit Cost          
Service cost $ 0 $ 0 $ 0 $ 0  
Interest cost 7,577,000 7,064,000 15,154,000 14,127,000  
Expected return on plan assets (8,854,000) (9,831,000) (17,708,000) (19,662,000)  
Amortization of net (gain) loss 3,455,000 3,705,000 6,910,000 7,410,000  
Amortization of prior service cost (241,000) (241,000) (483,000) (483,000)  
Net Periodic Benefit Cost (Income) 1,937,000 697,000 3,873,000 1,392,000  
Contributions by employer   0   30,000,000  
Total expected employer contributions for fiscal year 0   $ 0    
Public Service Company of New Mexico [Member] | Pension Plan [Member] | Minimum [Member]          
Components of Net Periodic Benefit Cost          
Assumptions used calculating net periodic benefit cost, discount rate     4.80%    
Public Service Company of New Mexico [Member] | Pension Plan [Member] | Maximum [Member]          
Components of Net Periodic Benefit Cost          
Assumptions used calculating net periodic benefit cost, discount rate     5.70%    
Public Service Company of New Mexico [Member] | OPEB [Member]          
Components of Net Periodic Benefit Cost          
Service cost 35,000 51,000 $ 70,000 102,000  
Interest cost 1,087,000 1,023,000 2,173,000 2,045,000  
Expected return on plan assets (1,371,000) (1,403,000) (2,742,000) (2,805,000)  
Amortization of net (gain) loss 286,000 491,000 572,000 983,000  
Amortization of prior service cost (7,000) (160,000) (15,000) (321,000)  
Net Periodic Benefit Cost (Income) 30,000 2,000 58,000 4,000  
Contributions by employer 800,000 800,000 1,600,000 1,600,000  
Total expected employer contributions for fiscal year 3,500,000   3,500,000    
Total expected employer contributions for future fiscal years 14,000,000   14,000,000    
Public Service Company of New Mexico [Member] | Executive Retirement Program [Member]          
Components of Net Periodic Benefit Cost          
Service cost 0 0 0 0  
Interest cost 203,000 190,000 406,000 380,000  
Expected return on plan assets 0 0 0 0  
Amortization of net (gain) loss 64,000 81,000 128,000 162,000  
Amortization of prior service cost 0 0 0 0  
Net Periodic Benefit Cost (Income) 267,000 271,000 534,000 542,000  
Contributions by employer 400,000 400,000 900,000 900,000  
Total expected employer contributions for fiscal year 1,500,000   1,500,000    
Total expected employer contributions for future fiscal years 5,900,000   5,900,000    
Texas-New Mexico Power Company [Member] | Pension Plan [Member]          
Components of Net Periodic Benefit Cost          
Service cost 0 0 0 0  
Interest cost 826,000 761,000 1,652,000 1,521,000  
Expected return on plan assets (986,000) (1,105,000) (1,971,000) (2,210,000)  
Amortization of net (gain) loss 175,000 195,000 350,000 391,000  
Amortization of prior service cost 0 0 0 0  
Net Periodic Benefit Cost (Income) 15,000 (149,000) 31,000 (298,000)  
Contributions by employer         $ 0
Total expected employer contributions for fiscal year 0   $ 0    
Texas-New Mexico Power Company [Member] | Pension Plan [Member] | Minimum [Member]          
Components of Net Periodic Benefit Cost          
Assumptions used calculating net periodic benefit cost, discount rate     4.80%    
Texas-New Mexico Power Company [Member] | Pension Plan [Member] | Maximum [Member]          
Components of Net Periodic Benefit Cost          
Assumptions used calculating net periodic benefit cost, discount rate     5.70%    
Texas-New Mexico Power Company [Member] | OPEB [Member]          
Components of Net Periodic Benefit Cost          
Service cost 46,000 62,000 $ 93,000 124,000  
Interest cost 169,000 152,000 339,000 304,000  
Expected return on plan assets (122,000) (130,000) (245,000) (260,000)  
Amortization of net (gain) loss (10,000) 0 (20,000) 0  
Amortization of prior service cost 0 0 0 0  
Net Periodic Benefit Cost (Income) 83,000 84,000 167,000 168,000  
Contributions by employer 0 0 0 0  
Total expected employer contributions for fiscal year 300,000   300,000    
Total expected employer contributions for future fiscal years 1,400,000   1,400,000    
Texas-New Mexico Power Company [Member] | Executive Retirement Program [Member]          
Components of Net Periodic Benefit Cost          
Service cost 0 0 0 0  
Interest cost 10,000 9,000 20,000 18,000  
Expected return on plan assets 0 0 0 0  
Amortization of net (gain) loss 1,000 1,000 1,000 2,000  
Amortization of prior service cost 0 0 0 0  
Net Periodic Benefit Cost (Income) 11,000 10,000 21,000 20,000  
Total expected employer contributions for fiscal year 100,000   100,000    
Total expected employer contributions for future fiscal years 400,000   400,000    
Texas-New Mexico Power Company [Member] | Executive Retirement Program [Member] | Maximum [Member]          
Components of Net Periodic Benefit Cost          
Contributions by employer $ 100,000 $ 100,000 $ 100,000 $ 100,000