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Lease Commitments - Operating Lease Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Operating leases:
Operating lease assets, net of amortization	$ 105,133	$ 131,212
Current portion of operating lease liabilities	27,460	29,068
Long-term portion of operating lease liabilities	81,065	105,512
Public Service Company of New Mexico
Operating leases:
Operating lease assets, net of amortization	97,461	120,585
Current portion of operating lease liabilities	25,130	25,927
Long-term portion of operating lease liabilities	75,941	97,992
Texas-New Mexico Power Company
Operating leases:
Operating lease assets, net of amortization	7,206	9,954
Current portion of operating lease liabilities	2,193	2,753
Long-term portion of operating lease liabilities	$ 4,779	$ 7,039

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- Definition

Operating Lease, Assets and Liabilities, Lessee [Abstract]

+ References

No definition available.

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977

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Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977

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