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Income Taxes Schedule of Components of Income Tax Expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Current federal income tax	$ (2,015)us-gaap_CurrentFederalTaxExpenseBenefit	$ 0us-gaap_CurrentFederalTaxExpenseBenefit	$ (1,296)us-gaap_CurrentFederalTaxExpenseBenefit
Current state income tax	(728)	(917)	(37)
Deferred federal income tax	59,814	50,044	51,559
Deferred state income tax	14,831	12,578	6,921
Amortization of accumulated investment tax credits	(2,164)us-gaap_InvestmentTaxCredit	(2,192)us-gaap_InvestmentTaxCredit	(2,237)us-gaap_InvestmentTaxCredit
Total income taxes	69,738us-gaap_IncomeTaxExpenseBenefit	59,513us-gaap_IncomeTaxExpenseBenefit	54,910us-gaap_IncomeTaxExpenseBenefit
Public Service Company of New Mexico [Member]
Income Taxes [Line Items]
Current federal income tax	(2,175)	(479)	(12,951)
Current state income tax	(979)	(760)	(1,815)
Deferred federal income tax	45,890	42,806	56,194
Deferred state income tax	12,061	9,429	11,522
Amortization of accumulated investment tax credits	(2,164)	(2,192)	(2,237)
Total income taxes	52,633	48,804	50,713
Texas-New Mexico Power Company [Member]
Income Taxes [Line Items]
Current federal income tax	35	(4,957)	9,152
Current state income tax	1,939	1,916	1,822
Deferred federal income tax	20,577	20,688	4,406
Deferred state income tax	(28)	(26)	(28)
Total income taxes	$ 22,523	$ 17,621	$ 15,352

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.