XML 11 R53.htm IDEA: XBRL DOCUMENT  v2.3.0.11
Pension and Other Postretirement Benefit Plans (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
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 8,202,000 8,518,000 16,402,000 17,037,000
Long-term return on plan assets (9,269,000) (9,339,000) (18,537,000) (18,677,000)
Amortization of net loss 2,302,000 1,613,000 4,605,000 3,225,000
Amortization of prior service cost 79,000 79,000 158,000 158,000
Net periodic benefit cost 1,314,000 871,000 2,628,000 1,743,000
Defined Benefit Plan, Contributions by Employer 7,500,000 0 13,500,000 6,500,000
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year 28,000,000   28,000,000  
Defined Benefit Plan, Estimated Future Employer Contributions After Current Fiscal Year 190,000,000   190,000,000  
Public Service Company of New Mexico [Member] | Other Postretirement Benefits [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 65,000 105,000 129,000 210,000
Interest cost 1,345,000 1,913,000 2,689,000 3,825,000
Long-term return on plan assets (1,347,000) (1,393,000) (2,694,000) (2,786,000)
Amortization of net loss 801,000 1,372,000 1,603,000 2,744,000
Amortization of prior service cost (662,000) (1,036,000) (1,324,000) (2,071,000)
Net periodic benefit cost 202,000 961,000 403,000 1,922,000
Defined Benefit Plan, Contributions by Employer 1,200,000 1,200,000 1,200,000 1,200,000
Defined Benefit Plan Total Expected Employer Contributions for Fiscal Year 2,500,000   2,500,000  
Public Service Company of New Mexico [Member] | Executive Retirement Program [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 0 0 0 0
Interest cost 233,000 263,000 465,000 527,000
Long-term return on plan assets 0 0 0 0
Amortization of net loss 23,000 18,000 47,000 35,000
Amortization of prior service cost 0 0 0 0
Net periodic benefit cost 256,000 281,000 512,000 562,000
Defined Benefit Plan, Contributions by Employer 400,000 400,000 800,000 700,000
Defined Benefit Plan Total Expected Employer Contributions for Fiscal Year 1,500,000   1,500,000  
Texas-New Mexico Power Company [Member] | Maximum [Member] | Executive Retirement Program [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Defined Benefit Plan, Contributions by Employer 100,000 100,000 100,000 100,000
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 951,000 1,032,000 1,900,000 2,063,000
Long-term return on plan assets (1,368,000) (1,449,000) (2,735,000) (2,897,000)
Amortization of net loss 86,000 0 173,000 0
Amortization of prior service cost 0 0 0 0
Net periodic benefit cost (331,000) (417,000) (662,000) (834,000)
Defined Benefit Plan, Contributions by Employer 100,000 0 200,000 0
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year 1,000,000   1,000,000  
Defined Benefit Plan, Estimated Future Employer Contributions After Current Fiscal Year 6,500,000   6,500,000  
Texas-New Mexico Power Company [Member] | Other Postretirement Benefits [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 77,000 72,000 153,000 144,000
Interest cost 163,000 178,000 327,000 356,000
Long-term return on plan assets (133,000) (129,000) (267,000) (257,000)
Amortization of net loss (48,000) (49,000) (96,000) (98,000)
Amortization of prior service cost 15,000 15,000 30,000 30,000
Net periodic benefit cost 74,000 87,000 147,000 175,000
Defined Benefit Plan, Contributions by Employer 400,000 600,000 400,000 600,000
Texas-New Mexico Power Company [Member] | Executive Retirement Program [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 0 0 0 0
Interest cost 12,000 13,000 23,000 26,000
Long-term return on plan assets 0 0 0 0
Amortization of net loss 0 (1,000) 0 (2,000)
Amortization of prior service cost 0 0 0 0
Net periodic benefit cost 12,000 12,000 23,000 24,000
Defined Benefit Plan Total Expected Employer Contributions for Fiscal Year $ 100,000   $ 100,000