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Significant Accounting Policies and Responsibility for Financial Statements (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Dividends Payable [Line Items]
Dividends declared on common stock (in dollars per share)		$ 0.20		$ 0.220	$ 0.200	$ 0.44	$ 0.400
Dividends declared on common stock						$ 17,524
Subsequent Event [Member]
Dividends Payable [Line Items]
Dividends declared on common stock (in dollars per share)	$ 0.22
Public Service Company of New Mexico [Member]
Dividends Payable [Line Items]
Equity contribution from parent						4,142
Dividends declared on common stock			$ 20,000			4,142
Texas-New Mexico Power Company [Member]
Dividends Payable [Line Items]
Dividends declared on common stock			$ 7,700			7,456
Common Stock [Member] | Public Service Company of New Mexico [Member]
Dividends Payable [Line Items]
Equity contribution from parent						$ 4,142

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- Definition

Amount of other increase (decrease) in additional paid in capital (APIC).

+ References

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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