Lease Commitments - Finance Lease Balance Sheet Information (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Financing leases:
Non-utility property	$ 10,028
Accumulated depreciation	(973)
Non-utility property, net	9,055
Other current liabilities	1,637
Other deferred credits	7,102
Public Service Company of New Mexico
Financing leases:
Non-utility property	4,857
Accumulated depreciation	(482)
Non-utility property, net	4,375
Other current liabilities	722
Other deferred credits	3,333
Texas-New Mexico Power Company
Financing leases:
Non-utility property	4,910
Accumulated depreciation	(466)
Non-utility property, net	4,444
Other current liabilities	850
Other deferred credits	$ 3,597