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Lease Commitments - Components of Lease Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Lease, Cost [Line Items]        
Operating lease cost: $ 4,346 $ 7,205 $ 11,552 $ 21,623
Amounts capitalized (373) (577) (1,365) (1,860)
Total operating lease expense 3,973 6,628 10,187 19,763
Financing lease cost:        
Amortization of right-of-use assets 2,389 1,585 6,718 4,680
Interest on lease liabilities 274 170 760 471
Amounts capitalized (1,915) (1,417) (5,389) (3,957)
Total financing lease expense 748 338 2,089 1,194
Variable lease expense 360 262 982 629
Short-term lease expense 190 567 490 2,884
Total lease expense for the period 5,271 7,795 13,748 24,470
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: 4,001 6,736 10,377 20,085
Amounts capitalized (71) (166) (334) (524)
Total operating lease expense 3,930 6,570 10,043 19,561
Financing lease cost:        
Amortization of right-of-use assets 1,193 792 3,325 2,293
Interest on lease liabilities 148 84 411 231
Amounts capitalized (844) (588) (2,313) (1,648)
Total financing lease expense 497 288 1,423 876
Variable lease expense 360 262 982 629
Short-term lease expense 174 568 438 2,837
Total lease expense for the period 4,961 7,688 12,886 23,903
TNMP        
Lease, Cost [Line Items]        
Operating lease cost: 345 466 1,175 1,489
Amounts capitalized (302) (410) (1,031) (1,336)
Total operating lease expense 43 56 144 153
Financing lease cost:        
Amortization of right-of-use assets 1,183 779 3,345 2,334
Interest on lease liabilities 126 85 349 238
Amounts capitalized (1,071) (829) (3,076) (2,309)
Total financing lease expense 238 35 618 263
Variable lease expense 0 0 0 0
Short-term lease expense 7 1 22 4
Total lease expense for the period $ 288 $ 92 $ 784 $ 420