Lease Commitments - Finance Lease Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financing leases:
Non-utility property	$ 32,188	$ 31,695
Accumulated depreciation	(11,171)	(9,660)
Non-utility property, net	21,017	22,035
Other current liabilities	5,881	5,813
Other deferred credits	15,008	16,075
PNM
Financing leases:
Non-utility property	15,613	15,171
Accumulated depreciation	(5,282)	(4,550)
Non-utility property, net	10,331	10,621
Other current liabilities	2,818	2,731
Other deferred credits	7,373	7,732
TNMP
Financing leases:
Non-utility property	16,232	16,181
Accumulated depreciation	(5,679)	(4,923)
Non-utility property, net	10,553	11,258
Other current liabilities	2,975	2,994
Other deferred credits	$ 7,586	$ 8,273