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Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Regulatory Assets
Current	$ 2,933	$ 3,855
Non-Current	600,672	501,223
Regulatory Liabilities
Current	(2,309)	(3,609)
Non-Current	(933,578)	(455,649)
Public Service Company of New Mexico
Regulatory Assets
Current	2,139	3,442
Non-Current	459,239	365,413
Total regulatory assets	461,378	368,855
Regulatory Liabilities
Current	(784)	(3,517)
Non-Current	(754,441)	(423,701)
Total regulatory liabilities	(755,225)	(427,218)
Public Service Company of New Mexico | Renewable energy rider
Regulatory Liabilities
Current	(779)	(3,411)
Public Service Company of New Mexico | Other
Regulatory Liabilities
Current	(5)	(106)
Public Service Company of New Mexico | Cost of removal
Regulatory Liabilities
Non-Current	(256,493)	(297,087)
Public Service Company of New Mexico | Deferred income taxes
Regulatory Liabilities
Non-Current	(445,390)	(62,920)
Public Service Company of New Mexico | PVNGS ARO
Regulatory Liabilities
Non-Current	(24,889)	(30,621)
Public Service Company of New Mexico | Renewable energy tax benefits
Regulatory Liabilities
Non-Current	(21,383)	(22,540)
Public Service Company of New Mexico | Nuclear spent fuel reimbursements
Regulatory Liabilities
Non-Current	(5,518)	(8,875)
Public Service Company of New Mexico | Pension and OPEB
Regulatory Liabilities
Non-Current	0	0
Public Service Company of New Mexico | Other
Regulatory Liabilities
Non-Current	(768)	(1,658)
Public Service Company of New Mexico | FPPAC
Regulatory Assets
Current	363	1,451
Public Service Company of New Mexico | Energy efficiency costs
Regulatory Assets
Current	1,776	1,991
Public Service Company of New Mexico | CTC, including carrying charges
Regulatory Assets
Non-Current	0	0
Public Service Company of New Mexico | Coal mine reclamation costs
Regulatory Assets
Non-Current	16,462	22,383
Public Service Company of New Mexico | Deferred income taxes
Regulatory Assets
Non-Current	59,220	62,918
Public Service Company of New Mexico | Loss on reacquired debt
Regulatory Assets
Non-Current	22,744	24,404
Public Service Company of New Mexico | Pension and OPEB
Regulatory Assets
Non-Current	222,774	249,286
Public Service Company of New Mexico | Shutdown of SJGS Units 2 and 3
Regulatory Assets
Non-Current	125,539	0
Public Service Company of New Mexico | Hurricane recovery costs
Regulatory Assets
Non-Current	0	0
Public Service Company of New Mexico | AMS surcharge
Regulatory Assets
Non-Current	0	0
Public Service Company of New Mexico | AMS retirement costs
Regulatory Assets
Non-Current	0	0
Public Service Company of New Mexico | Other
Regulatory Assets
Non-Current	12,500	6,422
Texas-New Mexico Power Company
Regulatory Assets
Current	794	413
Non-Current	141,433	135,810
Total regulatory assets	142,227	136,223
Regulatory Liabilities
Current	(1,525)	(92)
Non-Current	(179,137)	(31,948)
Total regulatory liabilities	(180,662)	(32,040)
Texas-New Mexico Power Company | Renewable energy rider
Regulatory Liabilities
Current	0	0
Texas-New Mexico Power Company | Other
Regulatory Liabilities
Current	(1,525)	(92)
Texas-New Mexico Power Company | Cost of removal
Regulatory Liabilities
Non-Current	(26,541)	(26,900)
Texas-New Mexico Power Company | Deferred income taxes
Regulatory Liabilities
Non-Current	(148,455)	(2,644)
Texas-New Mexico Power Company | PVNGS ARO
Regulatory Liabilities
Non-Current	0	0
Texas-New Mexico Power Company | Renewable energy tax benefits
Regulatory Liabilities
Non-Current	0	0
Texas-New Mexico Power Company | Nuclear spent fuel reimbursements
Regulatory Liabilities
Non-Current	0	0
Texas-New Mexico Power Company | Pension and OPEB
Regulatory Liabilities
Non-Current	(3,442)	(1,955)
Texas-New Mexico Power Company | Other
Regulatory Liabilities
Non-Current	(699)	(449)
Texas-New Mexico Power Company | FPPAC
Regulatory Assets
Current	0	0
Texas-New Mexico Power Company | Energy efficiency costs
Regulatory Assets
Current	794	413
Texas-New Mexico Power Company | CTC, including carrying charges
Regulatory Assets
Non-Current	26,998	36,328
Texas-New Mexico Power Company | Coal mine reclamation costs
Regulatory Assets
Non-Current	0	0
Texas-New Mexico Power Company | Deferred income taxes
Regulatory Assets
Non-Current	9,621	9,932
Texas-New Mexico Power Company | Loss on reacquired debt
Regulatory Assets
Non-Current	32,808	34,107
Texas-New Mexico Power Company | Pension and OPEB
Regulatory Assets
Non-Current	26,153	27,661
Texas-New Mexico Power Company | Shutdown of SJGS Units 2 and 3
Regulatory Assets
Non-Current	0	0
Texas-New Mexico Power Company | Hurricane recovery costs
Regulatory Assets
Non-Current	6,640	0
Texas-New Mexico Power Company | AMS surcharge
Regulatory Assets
Non-Current	27,903	14,669
Texas-New Mexico Power Company | AMS retirement costs
Regulatory Assets
Non-Current	8,948	11,086
Texas-New Mexico Power Company | Other
Regulatory Assets
Non-Current	$ 2,362	$ 2,027

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.

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