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Lease Commitments - Finance Lease Balance Sheet Information (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Financing leases:    
Non-utility property $ 25,997 $ 25,055
Accumulated depreciation (5,528) (4,383)
Non-utility property, net 20,469 20,672
Other current liabilities 4,641 4,470
Other deferred credits 15,616 15,972
PNM    
Financing leases:    
Non-utility property 12,140 11,453
Accumulated depreciation (2,575) (2,044)
Non-utility property, net 9,565 9,409
Other current liabilities 2,119 1,993
Other deferred credits 7,225 7,176
TNMP    
Financing leases:    
Non-utility property 13,535 13,299
Accumulated depreciation (2,833) (2,241)
Non-utility property, net 10,702 11,058
Other current liabilities 2,436 2,397
Other deferred credits $ 8,272 $ 8,669