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Pension and Other Postretirement Benefits - Other Postretirement Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
401(k) plan
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
401(k) plan	$ 16,648	$ 16,247	$ 16,097
401(k) plan | Public Service Company of New Mexico
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
401(k) plan	11,826	11,676	11,587
401(k) plan | Texas-New Mexico Power Company
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
401(k) plan	4,823	4,572	4,511
Non-qualified plan
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Non-qualified plan	3,594	2,090	4,551
Non-qualified plan | Public Service Company of New Mexico
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Non-qualified plan	2,622	1,544	3,384
Non-qualified plan | Texas-New Mexico Power Company
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Non-qualified plan	$ 972	$ 547	$ 1,167

X

- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

+ Details

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X

- References

No definition available.

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X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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