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Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Services billings: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	$ 23,190	$ 22,269	$ 47,593	$ 45,003
Services billings: | PNMR to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	7,806	7,240	15,943	14,288
Services billings: | PNM to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	102	104	187	189
Services billings: | TNMP to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	35	10	70	20
Services billings: | TNMP to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	57	88	145	88
Interest billings: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	9	5	11	5
Interest billings: | PNMR to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	30	48	60	98
Interest billings: | PNM to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	49	37	92	73
Income tax sharing payments: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	0	0	0	0
Income tax sharing payments: | PNMR to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	$ 0	$ 0	$ 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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