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Lease Commitments - Operating Lease Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Operating leases:
Operating lease assets, net of amortization	$ 99,017	$ 105,133
Current portion of operating lease liabilities	28,160	27,460
Long-term portion of operating lease liabilities	71,492	81,065
PNM
Operating leases:
Operating lease assets, net of amortization	91,652	97,461
Current portion of operating lease liabilities	25,868	25,130
Long-term portion of operating lease liabilities	66,657	75,941
TNMP
Operating leases:
Operating lease assets, net of amortization	6,937	7,206
Current portion of operating lease liabilities	2,185	2,193
Long-term portion of operating lease liabilities	$ 4,515	$ 4,779

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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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- Definition

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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