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Lease Commitments - Components of Lease Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Lease, Cost [Line Items]        
Operating lease cost: $ 7,205 $ 7,192 $ 21,623 $ 22,006
Amounts capitalized (577) (716) (1,860) (2,264)
Total operating lease expense 6,628 6,476 19,763 19,742
Financing lease cost:        
Amortization of right-of-use assets 1,585 1,372 4,680 3,802
Interest on lease liabilities 170 145 471 426
Amounts capitalized (1,417) (1,161) (3,957) (3,202)
Total financing lease expense 338 356 1,194 1,026
Variable lease expense 262 106 629 274
Short-term lease expense 567 1,578 2,884 1,857
Total lease expense for the period 7,795 8,516 24,470 22,899
Cooling Towers        
Financing lease cost:        
Short-term lease expense 400   2,700  
Increase reimbursements 400   2,700  
PNM        
Lease, Cost [Line Items]        
Operating lease cost: 6,736 6,569 20,085 20,020
Amounts capitalized (166) (199) (524) (645)
Total operating lease expense 6,570 6,370 19,561 19,375
Financing lease cost:        
Amortization of right-of-use assets 792 657 2,293 1,793
Interest on lease liabilities 84 66 231 193
Amounts capitalized (588) (452) (1,648) (1,235)
Total financing lease expense 288 271 876 751
Variable lease expense 262 106 629 274
Short-term lease expense 568 1,572 2,837 1,821
Total lease expense for the period 7,688 8,319 23,903 22,221
TNMP        
Lease, Cost [Line Items]        
Operating lease cost: 466 594 1,489 1,880
Amounts capitalized (410) (517) (1,336) (1,618)
Total operating lease expense 56 77 153 262
Financing lease cost:        
Amortization of right-of-use assets 779 693 2,334 1,944
Interest on lease liabilities 85 78 238 230
Amounts capitalized (829) (709) (2,309) (1,967)
Total financing lease expense 35 62 263 207
Variable lease expense 0 0 0 0
Short-term lease expense 1 2 4 6
Total lease expense for the period $ 92 $ 141 $ 420 $ 475