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Lease Commitments - Operating Lease Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Operating leases:
Operating lease assets, net of amortization	$ 150,426	$ 157,440
Current portion of operating lease liabilities	26,197	25,189
Long-term portion of operating lease liabilities	124,937	135,174
PNM
Operating leases:
Operating lease assets, net of amortization	137,756	143,816
Current portion of operating lease liabilities	22,762	21,589
Long-term portion of operating lease liabilities	115,436	124,891
TNMP
Operating leases:
Operating lease assets, net of amortization	12,160	12,942
Current portion of operating lease liabilities	3,023	3,132
Long-term portion of operating lease liabilities	$ 9,088	$ 9,787

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- Definition

Operating Lease, Assets and Liabilities, Lessee [Abstract]

+ References

No definition available.

+ Details

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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=77888419&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=77888419&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=77888419&loc=SL77918627-209977

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