Lease Commitments - Schedule of Supplemental Cash Flows Related to Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 9,318	$ 9,401
Operating cash flows from financing leases	31	30
Finance cash flows from financing leases	386	278
Non-cash information related to right-of-use assets obtained in exchange for lease obligations:
Operating leases	1,079	317
Financing leases	492	1,164
PNM
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	9,244	9,246
Operating cash flows from financing leases	22	21
Finance cash flows from financing leases	260	186
Non-cash information related to right-of-use assets obtained in exchange for lease obligations:
Operating leases	1,079	0
Financing leases	441	758
TNMP
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	49	97
Operating cash flows from financing leases	8	8
Finance cash flows from financing leases	104	71
Non-cash information related to right-of-use assets obtained in exchange for lease obligations:
Operating leases	0	317
Financing leases	$ 51	$ 387