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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance $ 1,654,813    
Amounts reclassified from AOCI (pre-tax) (15,871) $ (22,579) $ (8,152)
Income tax impact of amounts reclassified 6,193 8,849 3,234
Other OCI changes (pre-tax) (18,597) 6,665 2,038
Income tax impact of other OCI changes 7,256 (2,612) (735)
Total Other Comprehensive Income (Loss) (21,019) (9,677) $ (3,615)
Ending Balance $ 1,675,952 $ 1,654,813  
Percentage of pension liability adjustment capitalized into construction work in process 23.40% 22.20% 24.40%
Percentage of pension liability adjustment capitalized into other accounts 2.40% 2.40% 2.00%
Public Service Company of New Mexico [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance $ 1,317,933    
Amounts reclassified from AOCI (pre-tax) (16,635) $ (22,579) $ (8,710)
Income tax impact of amounts reclassified 6,491 8,849 3,429
Other OCI changes (pre-tax) (17,723) 6,593 2,191
Income tax impact of other OCI changes 6,915 (2,584) (788)
Total Other Comprehensive Income (Loss) (20,952) (9,721) (3,878)
Ending Balance 1,397,872 1,317,933  
Texas-New Mexico Power Company [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 533,380 524,665 502,931
Total Other Comprehensive Income (Loss) 0 0 263
Ending Balance 593,235 533,380 524,665
Unrealized Gain on Available-for-Sale Securities [Member] | Public Service Company of New Mexico [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 17,346 28,008 25,748
Amounts reclassified from AOCI (pre-tax) (22,139) (28,531) (13,862)
Income tax impact of amounts reclassified 8,639 11,181 5,461
Other OCI changes (pre-tax) 778 10,998 17,473
Income tax impact of other OCI changes (304) (4,310) (6,812)
Total Other Comprehensive Income (Loss) (13,026) (10,662) 2,260
Ending Balance 4,320 17,346 28,008
Pension Liability Adjustment [Member] | Public Service Company of New Mexico [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (88,822) (89,763) (83,625)
Amounts reclassified from AOCI (pre-tax) 5,504 5,952 5,152
Income tax impact of amounts reclassified (2,148) (2,332) (2,032)
Other OCI changes (pre-tax) (18,501) (4,405) (15,282)
Income tax impact of other OCI changes 7,219 1,726 6,024
Total Other Comprehensive Income (Loss) (7,926) 941 (6,138)
Ending Balance (96,748) (88,822) (89,763)
Fair Value Adjustment for Cash Flow Hedges [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 44 0 0
Amounts reclassified from AOCI (pre-tax) 764 0 0
Income tax impact of amounts reclassified (298) 0 0
Other OCI changes (pre-tax) (874) 72 0
Income tax impact of other OCI changes 341 (28) 0
Total Other Comprehensive Income (Loss) (67) 44 0
Ending Balance (23) 44 0
Fair Value Adjustment for Cash Flow Hedges [Member] | Texas-New Mexico Power Company [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 0 0 (263)
Amounts reclassified from AOCI (pre-tax) 0 0 558
Income tax impact of amounts reclassified 0 0 (195)
Other OCI changes (pre-tax) 0 0 (153)
Income tax impact of other OCI changes 0 0 53
Total Other Comprehensive Income (Loss) 0 0 263
Ending Balance 0 0 0
Total [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (71,432) (61,755) (58,140)
Total Other Comprehensive Income (Loss) (21,019) (9,677) (3,615)
Ending Balance (92,451) (71,432) (61,755)
Total [Member] | Public Service Company of New Mexico [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (71,476) (61,755) (57,877)
Total Other Comprehensive Income (Loss) (20,952) (9,721) (3,878)
Ending Balance $ (92,428) $ (71,476) (61,755)
Total [Member] | Texas-New Mexico Power Company [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance     (263)
Total Other Comprehensive Income (Loss)     $ 263