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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning Balance $ (61,755) $ (58,140) $ (81,630)
Amounts reclassified from AOCI (pre-tax) (22,579) (8,152) (5,385)
Income tax impact of amounts reclassified 8,849 3,234 2,137
Other OCI changes (pre-tax) 6,665 2,038 44,276
Income tax impact of other OCI changes (2,612) (735) (17,538)
Total Other Comprehensive Income (Loss) (9,677) (3,615) 23,490
Ending Balance $ (71,432) $ (61,755) (58,140)
Percentage of pension liability adjustment capitalized into construction work in process 22.20% 24.40%  
Percentage of pension liability adjustment capitalized into other accounts 2.40% 2.00%  
Public Service Company of New Mexico [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning Balance $ (61,755) $ (57,877) (81,414)
Amounts reclassified from AOCI (pre-tax) (22,579) (8,710) (5,592)
Income tax impact of amounts reclassified 8,849 3,429 2,210
Other OCI changes (pre-tax) 6,593 2,191 44,555
Income tax impact of other OCI changes (2,584) (788) (17,636)
Total Other Comprehensive Income (Loss) (9,721) (3,878) 23,537
Ending Balance (71,476) (61,755) (57,877)
Texas-New Mexico Power Company [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Total Other Comprehensive Income (Loss) 0 263 (47)
Unrealized Gain on Available-for-Sale Securities [Member] | Public Service Company of New Mexico [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning Balance 28,008 25,748 16,406
Amounts reclassified from AOCI (pre-tax) (28,531) (13,862) (11,956)
Income tax impact of amounts reclassified 11,181 5,461 4,734
Other OCI changes (pre-tax) 10,998 17,473 27,419
Income tax impact of other OCI changes (4,310) (6,812) (10,855)
Total Other Comprehensive Income (Loss) (10,662) 2,260 9,342
Ending Balance 17,346 28,008 25,748
Pension Liability Adjustment [Member] | Public Service Company of New Mexico [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning Balance (89,763) (83,625) (97,820)
Amounts reclassified from AOCI (pre-tax) 5,952 5,152 6,364
Income tax impact of amounts reclassified (2,332) (2,032) (2,524)
Other OCI changes (pre-tax) (4,405) (15,282) 17,136
Income tax impact of other OCI changes 1,726 6,024 (6,781)
Total Other Comprehensive Income (Loss) 941 (6,138) 14,195
Ending Balance (88,822) (89,763) (83,625)
Fair Value Adjustment for Cash Flow Hedges [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning Balance 0 0 0
Amounts reclassified from AOCI (pre-tax) 0 0 0
Income tax impact of amounts reclassified 0 0 0
Other OCI changes (pre-tax) 72 0 0
Income tax impact of other OCI changes (28) 0 0
Total Other Comprehensive Income (Loss) 44 0 0
Ending Balance 44 0 0
Fair Value Adjustment for Cash Flow Hedges [Member] | Texas-New Mexico Power Company [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning Balance 0 (263) (216)
Amounts reclassified from AOCI (pre-tax) 0 558 207
Income tax impact of amounts reclassified 0 (195) (73)
Other OCI changes (pre-tax) 0 (153) (279)
Income tax impact of other OCI changes 0 53 98
Total Other Comprehensive Income (Loss) 0 263 (47)
Ending Balance $ 0 $ 0 $ (263)