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Income Taxes - Carryforwards (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Taxes, Impairment of Carryforwards |  |  |
State tax credit carryforwards | $ 1,029 | $ (425) | $ 425
Compensation expense | 119 | 96 | (99)
Income Taxes, Reserve Balances |  |  |
Federal tax credit carryforwards | 1,029 |  |
Compensation expense | 526 | 407 |
Internal Revenue Service (IRS) |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Federal net operating loss carryforwards | 196,200 |  |
Federal tax credit carryforwards that expire beginning in 2023 | 122,400 |  |
Public Service Company of New Mexico |  |  |
Income Taxes, Impairment of Carryforwards |  |  |
State tax credit carryforwards | 0 | 0 | 0
Compensation expense | 84 | 61 | (100)
Income Taxes, Reserve Balances |  |  |
Federal tax credit carryforwards | 0 |  |
Compensation expense | 343 | 259 |
Texas-New Mexico Power Company |  |  |
Income Taxes, Impairment of Carryforwards |  |  |
State tax credit carryforwards | 0 | 0 | 0
Compensation expense | 35 | 35 | $ 2
Income Taxes, Reserve Balances |  |  |
Federal tax credit carryforwards | 0 |  |
Compensation expense | $ 182 | $ 148 |

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319 + Details
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