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Lease Commitments - Components of Lease Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Lease, Cost [Line Items]    
Operating lease cost: $ 4,337 $ 7,237
Amounts capitalized (513) (654)
Total operating lease expense 3,824 6,583
Financing lease cost:    
Amortization of right-of-use assets 2,093 1,511
Interest on lease liabilities 234 141
Amounts capitalized (1,690) (1,213)
Total financing lease expense 637 439
Variable lease expense 262 106
Short-term lease expense 151 1,169
Total lease expense for the period 4,874 8,297
Cooling Towers    
Financing lease cost:    
Short-term lease expense 1,100  
Increase reimbursements 1,100  
PNM    
Lease, Cost [Line Items]    
Operating lease cost: 3,908 6,683
Amounts capitalized (160) (185)
Total operating lease expense 3,748 6,498
Financing lease cost:    
Amortization of right-of-use assets 1,008 732
Interest on lease liabilities 122 68
Amounts capitalized (690) (497)
Total financing lease expense 440 303
Variable lease expense 262 106
Short-term lease expense 147 1,132
Total lease expense for the period 4,597 8,039
TNMP    
Lease, Cost [Line Items]    
Operating lease cost: 429 528
Amounts capitalized (353) (469)
Total operating lease expense 76 59
Financing lease cost:    
Amortization of right-of-use assets 1,064 757
Interest on lease liabilities 111 73
Amounts capitalized (1,000) (717)
Total financing lease expense 175 113
Variable lease expense 0 0
Short-term lease expense 0 0
Total lease expense for the period $ 251 $ 172