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Lease Commitments - Schedule of Supplemental Cash Flows Related to Leases (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 16,572	$ 17,125
Operating cash flows from financing leases	63	59
Finance cash flows from financing leases	592	360
Non-cash information related to right-of-use assets obtained in exchange for lease obligations:
Operating leases	317	0
Financing leases	2,793	8,513
PNM
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	16,291	16,511
Operating cash flows from financing leases	43	36
Finance cash flows from financing leases	392	207
Non-cash information related to right-of-use assets obtained in exchange for lease obligations:
Operating leases	0	0
Financing leases	1,512	3,703
TNMP
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	188	331
Operating cash flows from financing leases	17	20
Finance cash flows from financing leases	156	120
Non-cash information related to right-of-use assets obtained in exchange for lease obligations:
Operating leases	317	0
Financing leases	$ 1,254	$ 4,802

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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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