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Lease Commitments - Components of Lease Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Lease, Cost [Line Items]        
Operating lease cost: $ 7,181 $ 7,385 $ 14,418 $ 14,814
Amounts capitalized (630) (763) (1,283) (1,548)
Total operating lease expense 6,551 6,622 13,135 13,266
Financing lease cost:        
Amortization of right-of-use assets 1,583 1,262 3,095 2,430
Interest on lease liabilities 160 141 301 281
Amounts capitalized (1,327) (1,048) (2,540) (2,041)
Total financing lease expense 416 355 856 670
Variable lease expense 262 106 367 168
Short-term lease expense 1,147 147 2,317 280
Total lease expense for the period 8,376 7,230 16,675 14,384
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: 6,665 6,715 13,349 13,450
Amounts capitalized (173) (220) (358) (446)
Total operating lease expense 6,492 6,495 12,991 13,004
Financing lease cost:        
Amortization of right-of-use assets 769 604 1,501 1,136
Interest on lease liabilities 79 65 147 127
Amounts capitalized (563) (417) (1,060) (783)
Total financing lease expense 285 252 588 480
Variable lease expense 262 106 367 168
Short-term lease expense 1,137 125 2,269 249
Total lease expense for the period 8,176 6,978 16,215 13,901
TNMP        
Lease, Cost [Line Items]        
Operating lease cost: 495 633 1,023 1,286
Amounts capitalized (457) (543) (926) (1,102)
Total operating lease expense 38 90 97 184
Financing lease cost:        
Amortization of right-of-use assets 799 637 1,555 1,251
Interest on lease liabilities 80 76 153 152
Amounts capitalized (764) (632) (1,480) (1,258)
Total financing lease expense 115 81 228 145
Variable lease expense 0 0 0 0
Short-term lease expense 3 2 3 4
Total lease expense for the period $ 156 $ 173 $ 328 $ 333