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Commitments and Contingencies - Coal Supply (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 17, 2022 $ / T | Dec. 31, 2020 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jan. 31, 2016 USD ($)
Other Commitments [Line Items] |  |  |  |  |  |
Other current assets |  |  | $ 31,624 | $ 1,635 |  |
Four Corners | Coal Supply |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Payments for relief from obligations |  |  | 75,000 |  |  |
Public Service Company of New Mexico |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Other current assets |  |  | 20,706 | 1,456 |  |
Public Service Company of New Mexico | Loss on long-term purchase commitment | San Juan Generating Station |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Annual funding post-term reclamation trust |  |  | 10,000 | 5,200 | $ 3,200 |
Public Service Company of New Mexico | Mine Reclamation Trust | Four Corners |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Funds contributed to mine reclamation trust |  |  | 2,400 | 2,200 | 2,000 |
Funds contributed next fiscal year through year five |  |  | 2,100 |  |  |
Public Service Company of New Mexico | Mine Reclamation Trust | San Juan Generating Station And Four Corners |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Customer reclamation funding cost, maximum |  |  | 100,000 |  |  |
Public Service Company of New Mexico | Surface | Loss on long-term purchase commitment |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Liability for interim storage costs |  |  | 62,600 | 67,400 |  |
Public Service Company of New Mexico | Surface | Increase in coal mine decommissioning liability |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Net expense |  | $ 3,600 |  |  |  |
Public Service Company of New Mexico | Underground | Loss on long-term purchase commitment |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Liability for interim storage costs |  |  | 28,200 | 27,900 |  |
Public Service Company of New Mexico | Underground | Increase in coal mine decommissioning liability |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Net expense |  | $ 100 |  |  |  |
Public Service Company of New Mexico | San Juan Generating Station | Surface | Loss on long-term purchase commitment |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Estimate of possible loss |  |  | 67,700 |  |  |
Public Service Company of New Mexico | San Juan Generating Station | Underground | Loss on long-term purchase commitment |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Estimate of possible loss |  |  | 33,300 |  |  |
Public Service Company of New Mexico | San Juan Generating Station | Coal Supply |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Other current assets |  |  |  | $ 20,400 |  |
Increase in price of coal (per ton) | $ / T | 5.00 |  |  |  |  |
Public Service Company of New Mexico | Four Corners | Increase in coal mine decommissioning liability |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Net expense |  |  |  |  | $ 2,500 |
NM Capital | San Juan Generating Station | Coal Supply |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Coal mine reclamation bonds to be posted with NMMMD |  |  | 118,700 |  |  |
Issuance in letters of credit |  |  | $ 30,300 |  |  | $ 30,300

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