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Lease Commitments - Components of Lease Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Lessee, Lease, Description [Line Items]    
Operating lease cost $ 28,835 $ 29,270
Amounts capitalized (2,417) (2,951)
Total operating lease expense 26,418 26,319
Financing lease cost:    
Amortization of right-of-use assets 6,529 5,277
Interest on lease liabilities 659 574
Amounts capitalized (5,471) (4,404)
Total financing lease expense 1,717 1,447
Variable lease expense 890 380
Short-term lease expense 3,109 3,035
Total lease expense for the period 32,134 31,181
Cooling Towers    
Financing lease cost:    
Short-term lease expense 2,700 2,500
Insurance settlements receivable 2,700 1,800
Public Service Company of New Mexico    
Lessee, Lease, Description [Line Items]    
Operating lease cost 26,764 26,690
Amounts capitalized (690) (836)
Total operating lease expense 26,074 25,854
Financing lease cost:    
Amortization of right-of-use assets 3,175 2,507
Interest on lease liabilities 327 263
Amounts capitalized (2,264) (1,726)
Total financing lease expense 1,238 1,044
Variable lease expense 890 380
Short-term lease expense 3,058 2,972
Total lease expense for the period 31,260 30,250
Texas-New Mexico Power Company    
Lessee, Lease, Description [Line Items]    
Operating lease cost 2,020 2,445
Amounts capitalized (1,728) (2,115)
Total operating lease expense 292 330
Financing lease cost:    
Amortization of right-of-use assets 3,279 2,682
Interest on lease liabilities 330 307
Amounts capitalized (3,208) (2,678)
Total financing lease expense 401 311
Variable lease expense 0 0
Short-term lease expense 5 6
Total lease expense for the period $ 698 $ 647