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Lease Commitments - Finance Lease Balance Sheet Information (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Financing leases:    
Non-utility property $ 43,815 $ 39,738
Accumulated depreciation (18,282) (16,189)
Non-utility property, net 25,533 23,549
Other current liabilities 8,193 7,363
Other deferred credits 17,298 16,123
PNM    
Financing leases:    
Non-utility property 22,054 19,324
Accumulated depreciation (8,734) (7,726)
Non-utility property, net 13,320 11,598
Other current liabilities 3,990 3,441
Other deferred credits 9,273 8,079
TNMP    
Financing leases:    
Non-utility property 21,431 20,084
Accumulated depreciation (9,266) (8,202)
Non-utility property, net 12,165 11,882
Other current liabilities 4,166 3,867
Other deferred credits $ 8,014 $ 8,028