Lease Commitments - Schedule of Supplemental Cash Flows Related to Leases (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 25,670	$ 25,897
Operating cash flows from financing leases	101	92
Finance cash flows from financing leases	1,249	920
Non-cash information related to right-of-use assets obtained in exchange for lease obligations:
Operating leases	2,924	317
Financing leases	5,381	5,567
PNM
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	25,503	25,511
Operating cash flows from financing leases	67	65
Finance cash flows from financing leases	810	621
Non-cash information related to right-of-use assets obtained in exchange for lease obligations:
Operating leases	2,924	0
Financing leases	3,032	2,898
TNMP
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	118	262
Operating cash flows from financing leases	32	24
Finance cash flows from financing leases	371	234
Non-cash information related to right-of-use assets obtained in exchange for lease obligations:
Operating leases	0	317
Financing leases	$ 2,349	$ 2,642