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Goodwill (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Apr. 01, 2015	Dec. 31, 2014	Sep. 30, 2014	Apr. 01, 2014	Apr. 01, 2012
Goodwill [Line Items]
Goodwill	$ 278,297		$ 278,297	$ 278,297
Public Service Company of New Mexico [Member]
Goodwill [Line Items]
Goodwill		$ 51,600			$ 51,600
Percentage of fair value in excess of carrying amount		25.00%			30.00%
Texas-New Mexico Power Company [Member]
Goodwill [Line Items]
Goodwill						$ 226,700
Percentage of fair value in excess of carrying amount						26.00%

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



-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 45



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Percentage of fair value of reporting unit in excess of carrying amount.

+ References

No definition available.

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