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Lease Commitments - Schedule of Supplemental Cash Flows Related to Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 9,401	$ 9,658
Operating cash flows from financing leases	30	27
Finance cash flows from financing leases	278	147
Non-cash information related to right-of-use assets obtained in exchange for lease obligations:
Operating leases	317	0
Financing leases	1,164	4,272
PNM
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	9,246	9,351
Operating cash flows from financing leases	21	16
Finance cash flows from financing leases	186	80
Non-cash information related to right-of-use assets obtained in exchange for lease obligations:
Operating leases	0	0
Financing leases	758	1,463
TNMP
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	97	166
Operating cash flows from financing leases	8	9
Finance cash flows from financing leases	71	51
Non-cash information related to right-of-use assets obtained in exchange for lease obligations:
Operating leases	317	0
Financing leases	$ 387	$ 2,802

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Amount of interest paid on finance lease liability.

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Amount of cash outflow for principal payment on finance lease.

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