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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018	Jan. 01, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 1,695,253
Cumulative effect adjustment (Note 9)				$ 0	$ 10,382
Balance at January 1, 2018, as adjusted				1,761,448	1,755,254
Amounts reclassified from AOCI (pre-tax)	3,965	$ (10,534)	$ (15,871)
Income tax impact of amounts reclassified	(1,008)	4,087	6,193
Other OCI changes (pre-tax)	(6,022)	32,778	(18,597)
Income tax impact of other OCI changes	1,529	(12,234)	7,256
Total Other Comprehensive Income (Loss)	(1,536)	14,097	(21,019)
Reclassification of stranded income taxes to retained earnings		0
Ending Balance	1,688,382	1,695,253
Public Service Company of New Mexico
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	1,422,174
Balance at January 1, 2018, as adjusted				1,488,369
Amounts reclassified from AOCI (pre-tax)	3,749	(11,115)	(16,635)
Income tax impact of amounts reclassified	(952)	4,312	6,491
Other OCI changes (pre-tax)	(6,592)	31,778	(17,723)
Income tax impact of other OCI changes	1,674	(11,846)	6,915
Total Other Comprehensive Income (Loss)	(2,121)	13,129	(20,952)
Reclassification of stranded income taxes to retained earnings		0
Ending Balance	1,397,359	1,422,174
AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(95,940)	(92,451)	(71,432)
Cumulative effect adjustment (Note 9)				(11,208)
Balance at January 1, 2018, as adjusted				(107,148)	$ (92,451)
Total Other Comprehensive Income (Loss)	(1,536)	14,097	(21,019)
Reclassification of stranded income taxes to retained earnings		(17,586)
Ending Balance	(108,684)	(95,940)	(92,451)
AOCI | Public Service Company of New Mexico
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(97,093)	(92,428)	(71,476)
Cumulative effect adjustment (Note 9)				(11,208)
Balance at January 1, 2018, as adjusted				(108,301)
Total Other Comprehensive Income (Loss)	(2,121)	13,129	(20,952)
Reclassification of stranded income taxes to retained earnings		(17,794)
Ending Balance	(110,422)	(97,093)	(92,428)
Unrealized Gains on Available-for-Sale Securities | Public Service Company of New Mexico
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	13,169	4,320	17,346
Cumulative effect adjustment (Note 9)				(11,208)
Balance at January 1, 2018, as adjusted				1,961
Amounts reclassified from AOCI (pre-tax)	(3,819)	(17,567)	(22,139)
Income tax impact of amounts reclassified	970	6,816	8,639
Other OCI changes (pre-tax)	3,790	28,160	778
Income tax impact of other OCI changes	(963)	(10,927)	(304)
Total Other Comprehensive Income (Loss)	(22)	6,482	(13,026)
Reclassification of stranded income taxes to retained earnings		2,367
Ending Balance	1,939	13,169	4,320
Pension Liability Adjustment | Public Service Company of New Mexico
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(110,262)	(96,748)	(88,822)
Cumulative effect adjustment (Note 9)				0
Balance at January 1, 2018, as adjusted				(110,262)
Amounts reclassified from AOCI (pre-tax)	7,568	6,452	5,504
Income tax impact of amounts reclassified	(1,922)	(2,504)	(2,148)
Other OCI changes (pre-tax)	(10,382)	3,618	(18,501)
Income tax impact of other OCI changes	2,637	(919)	7,219
Total Other Comprehensive Income (Loss)	(2,099)	6,647	(7,926)
Reclassification of stranded income taxes to retained earnings		(20,161)
Ending Balance	(112,361)	(110,262)	(96,748)
Fair Value Adjustment for Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	1,153	(23)	44
Cumulative effect adjustment (Note 9)				0
Balance at January 1, 2018, as adjusted				$ 1,153
Amounts reclassified from AOCI (pre-tax)	216	581	764
Income tax impact of amounts reclassified	(56)	(225)	(298)
Other OCI changes (pre-tax)	570	1,000	(874)
Income tax impact of other OCI changes	(145)	(388)	341
Total Other Comprehensive Income (Loss)	585	968	(67)
Reclassification of stranded income taxes to retained earnings		208
Ending Balance	$ 1,738	$ 1,153	$ (23)

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