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Goodwill (Details) - USD ($)	Apr. 01, 2017	Apr. 01, 2016	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Goodwill [Line Items]
Impairments of goodwill	$ 0	$ 0
Goodwill			$ 278,297,000	$ 278,297,000	$ 278,297,000
PNM
Goodwill [Line Items]
Goodwill			51,632,000	51,632,000	$ 51,600,000
Goodwill fair value exceeded by its carrying value					25.00%
TNMP
Goodwill [Line Items]
Goodwill			$ 226,665,000	$ 226,665,000	$ 226,700,000
Goodwill fair value exceeded by its carrying value					32.00%

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
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-Name Accounting Standards Codification
-Topic 230
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- Definition

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