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Income Taxes - Interest Income (Expense) Related to Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |
Interest income related to income taxes | $ 0 | $ 0 | $ 4,398
Public Service Company of New Mexico |  |  |
Income Taxes [Line Items] |  |  |
Interest income related to income taxes | 0 | 0 | 3,625
Texas-New Mexico Power Company |  |  |
Income Taxes [Line Items] |  |  |
Interest income related to income taxes | 0 | $ 0 | 345
Interest income and interest expense applicable to federal income tax matters |  |  |
Income Taxes [Line Items] |  |  |
Net refunds received |  |  | 6,500
Increase (decrease) of net interest receivable |  |  | 2,100
Interest income |  |  | 5,100
Interest expense |  |  | 700
Professional fees |  |  | 900
Net pre-tax impacts |  |  | 3,500
Interest income and interest expense applicable to federal income tax matters | Public Service Company of New Mexico |  |  |
Income Taxes [Line Items] |  |  |
Net pre-tax impacts |  |  | 2,600
Interest income and interest expense applicable to federal income tax matters | Texas-New Mexico Power Company |  |  |
Income Taxes [Line Items] |  |  |
Net pre-tax impacts |  |  | 300
Interest income and interest expense applicable to federal income tax matters | Corporate and Other |  |  |
Income Taxes [Line Items] |  |  |
Net pre-tax impacts |  |  | $ 600
2015 Electric Rate Case | Public Service Company of New Mexico |  |  |
Income Taxes [Line Items] |  |  |
Approval to recover impairment of net operating loss carryforward | $ (2,100) |  |

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- Definition The increase (decrease) during the reporting period in the aggregate amount due to the entity in the form of unpaid interest and dividends. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition The amount of cash received during the period as refunds for the overpayment of taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 + Details
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- Definition A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.2(a),(b),(c),(d)) -URI http://asc.fasb.org/extlink&oid=114873854&loc=SL114874292-224272 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 220 -Section 45 -Paragraph 3 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=114873831&loc=SL114874205-224268 + Details
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- Definition Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=115928272&loc=d3e28511-109314 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=115928272&loc=d3e28446-109314 + Details
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