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Fair Value of Derivative and Other Financial Instruments - Items not Recorded at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
PNMR [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 2,540,693	$ 2,264,869
Westmoreland Loan	100,893
Investment in PVNGS lessor notes		8,947
Other investments	1,164	1,269
PNMR [Member] | Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	2,392,712	2,091,948
Westmoreland Loan	95,000
Investment in PVNGS lessor notes		8,587
Other investments	547	604
PNMR [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member}
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	0	0
Westmoreland Loan	0
Investment in PVNGS lessor notes		0
Other investments	547	604
PNMR [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	2,540,693	2,264,869
Westmoreland Loan	0
Investment in PVNGS lessor notes		0
Other investments	0	0
PNMR [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	0	0
Westmoreland Loan	100,893
Investment in PVNGS lessor notes		8,947
Other investments	617	665
Public Service Company of New Mexico [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	1,730,157	1,703,209
Investment in PVNGS lessor notes		8,947
Other investments	316	366
Public Service Company of New Mexico [Member] | Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	1,631,369	1,580,677
Investment in PVNGS lessor notes		8,587
Other investments	316	366
Public Service Company of New Mexico [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member}
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	0	0
Investment in PVNGS lessor notes		0
Other investments	316	366
Public Service Company of New Mexico [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	1,730,157	1,703,209
Investment in PVNGS lessor notes		0
Other investments	0	0
Public Service Company of New Mexico [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	0	0
Investment in PVNGS lessor notes		8,947
Other investments	0	0
Texas-New Mexico Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	468,329	411,661
Other investments	231	238
Texas-New Mexico Power Company [Member] | Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	420,875	361,411
Other investments	231	238
Texas-New Mexico Power Company [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member}
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	0	0
Other investments	231	238
Texas-New Mexico Power Company [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	468,329	411,661
Other investments	0	0
Texas-New Mexico Power Company [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	0	0
Other investments	$ 0	$ 0

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Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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