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Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Services billings: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	$ 23,679	$ 24,402
Services billings: | PNMR to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	8,365	8,137
Services billings: | PNM to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	86	85
Services billings: | TNMP to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	35	35
Services billings: | PNMR to NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	78	0
Renewable energy purchases: | PNM from NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	370	0
Interest billings: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	62	0
Interest billings: | PNMR to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	8	31
Interest billings: | PNM to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	66	43
Income tax sharing payments: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	0	0
Income tax sharing payments: | PNMR to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	0	0
Income tax sharing payments: | TNMP to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	$ 0	$ 0

X

- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864

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- Definition

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+ References

No definition available.

+ Details

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- Details

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