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Lease Commitments - Components of Lease Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Lease, Cost [Line Items]        
Operating lease cost: $ 2,869 $ 7,181 $ 7,206 $ 14,418
Amounts capitalized (434) (630) (947) (1,283)
Total operating lease expense 2,435 6,551 6,259 13,135
Financing lease cost:        
Amortization of right-of-use assets 2,235 1,583 4,329 3,095
Interest on lease liabilities 252 160 486 301
Amounts capitalized (1,477) (1,327) (3,167) (2,540)
Total financing lease expense 1,010 416 1,648 856
Variable lease expense 360 262 622 367
Short-term lease expense 149 1,147 299 2,317
Total lease expense for the period 3,954 8,376 8,828 16,675
Cooling Towers        
Financing lease cost:        
Short-term lease expense   1,100   2,300
Increase reimbursements   1,100   2,300
PNM        
Lease, Cost [Line Items]        
Operating lease cost: 2,468 6,665 6,376 13,349
Amounts capitalized (103) (173) (263) (358)
Total operating lease expense 2,365 6,492 6,113 12,991
Financing lease cost:        
Amortization of right-of-use assets 1,123 769 2,132 1,501
Interest on lease liabilities 140 79 262 147
Amounts capitalized (778) (563) (1,469) (1,060)
Total financing lease expense 485 285 925 588
Variable lease expense 360 262 622 367
Short-term lease expense 145 1,137 292 2,269
Total lease expense for the period 3,355 8,176 7,952 16,215
TNMP        
Lease, Cost [Line Items]        
Operating lease cost: 401 495 830 1,023
Amounts capitalized (331) (457) (684) (926)
Total operating lease expense 70 38 146 97
Financing lease cost:        
Amortization of right-of-use assets 1,098 799 2,162 1,555
Interest on lease liabilities 112 80 223 153
Amounts capitalized (699) (764) (1,699) (1,480)
Total financing lease expense 511 115 686 228
Variable lease expense 0 0 0 0
Short-term lease expense 1 3 1 3
Total lease expense for the period $ 582 $ 156 $ 833 $ 328