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Lease Commitments - Components of Lease Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Lease, Cost [Line Items]    
Operating lease cost: $ 7,429 $ 7,735
Amounts capitalized (785) (925)
Total operating lease expense 6,644 6,810
Financing lease cost:    
Amortization of right-of-use assets 1,167 553
Interest on lease liabilities 139 103
Amounts capitalized (993) (458)
Total financing lease expense 313 198
Variable lease expense 63 32
Short-term lease expense 132 86
Total lease expense for the period 7,152 7,126
PNM    
Lease, Cost [Line Items]    
Operating lease cost: 6,735 6,893
Amounts capitalized (226) (291)
Total operating lease expense 6,509 6,602
Financing lease cost:    
Amortization of right-of-use assets 532 247
Interest on lease liabilities 62 45
Amounts capitalized (368) (175)
Total financing lease expense 226 117
Variable lease expense 63 32
Short-term lease expense 124 85
Total lease expense for the period 6,922 6,836
TNMP    
Lease, Cost [Line Items]    
Operating lease cost: 653 774
Amounts capitalized (559) (634)
Total operating lease expense 94 140
Financing lease cost:    
Amortization of right-of-use assets 613 289
Interest on lease liabilities 76 56
Amounts capitalized (625) (283)
Total financing lease expense 64 62
Variable lease expense 0 0
Short-term lease expense 2 1
Total lease expense for the period $ 160 $ 203