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Lease Commitments - Components of Lease Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Lease, Cost [Line Items] |  |
Operating lease cost: |  | $ 4,337
Amounts capitalized | $ (267) | (513)
Operating lease cost: | 5,009 | 3,824
Financing lease cost: |  |
Amortization of right-of-use assets | 2,542 | 2,093
Interest on lease liabilities | 297 | 234
Amounts capitalized | (2,023) | (1,690)
Total financing lease expense | 816 | 637
Variable lease expense | 360 | 262
Short-term lease expense | 216 | 151
Total lease expense for the period | 6,401 | 4,874
Battery Storage Leases |  |
Lease, Cost [Line Items] |  |
Operating lease cost: | 2,947 |
Other Operating Leases |  |
Lease, Cost [Line Items] |  |
Operating lease cost: | 2,329 |
PNM |  |
Lease, Cost [Line Items] |  |
Operating lease cost: |  | 3,908
Amounts capitalized | (35) | (160)
Operating lease cost: | 4,971 | 3,748
Financing lease cost: |  |
Amortization of right-of-use assets | 1,218 | 1,008
Interest on lease liabilities | 144 | 122
Amounts capitalized | (841) | (690)
Total financing lease expense | 521 | 440
Variable lease expense | 360 | 262
Short-term lease expense | 204 | 147
Total lease expense for the period | 6,056 | 4,597
PNM | Battery Storage Leases |  |
Lease, Cost [Line Items] |  |
Operating lease cost: | 2,947 |
PNM | Other Operating Leases |  |
Lease, Cost [Line Items] |  |
Operating lease cost: | 2,059 |
TNMP |  |
Lease, Cost [Line Items] |  |
Operating lease cost: |  | 429
Amounts capitalized | (232) | (353)
Operating lease cost: | 38 | 76
Financing lease cost: |  |
Amortization of right-of-use assets | 1,316 | 1,064
Interest on lease liabilities | 152 | 111
Amounts capitalized | (1,182) | (1,000)
Total financing lease expense | 286 | 175
Variable lease expense | 0 | 0
Short-term lease expense | 6 | 0
Total lease expense for the period | 330 | $ 251
TNMP | Battery Storage Leases |  |
Lease, Cost [Line Items] |  |
Operating lease cost: | 0 |
TNMP | Other Operating Leases |  |
Lease, Cost [Line Items] |  |
Operating lease cost: | $ 270 |

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