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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes [Line Items] |  |  |
Interest income related to income taxes | $ 4,398 | $ 0 | $ 146
Public Service Company of New Mexico [Member] |  |  |
Income Taxes [Line Items] |  |  |
Interest income related to income taxes | 3,625 | 0 | 148
Texas-New Mexico Power Company [Member] |  |  |
Income Taxes [Line Items] |  |  |
Interest income related to income taxes | 345 | $ 0 | $ (2)
Interest Income and Interest Expense applicable to federal income tax matters [Member] |  |  |
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 [Member] | Public Service Company of New Mexico [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net pre-tax impacts | 2,600 |  |
Interest Income and Interest Expense applicable to federal income tax matters [Member] | Texas-New Mexico Power Company [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net pre-tax impacts | 300 |  |
Interest Income and Interest Expense applicable to federal income tax matters [Member] | Corporate and Other [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net pre-tax impacts | $ 600 |  |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition Amount of interest expense classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624177-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph -4 -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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