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Income Taxes Schedule of Deferred Income Tax Components (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | $ 12,665 |  |
Change in tax effects of income tax related regulatory assets and liabilities | (1,896) |  |
Tax effect of mark-to-market adjustments | 6,844 |  |
Tax effect of excess pension liability | (607) |  |
Reclassification of unrecognized tax benefits | (8,576) |  |
Reclassification of unrecognized tax benefits | 8,576 |  |
Other | (555) |  |
Deferred income taxes | 16,451 | $ 72,481 | $ 60,430
Public Service Company of New Mexico [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | (7,012) |  |
Change in tax effects of income tax related regulatory assets and liabilities | (1,784) |  |
Tax effect of mark-to-market adjustments | 6,872 |  |
Tax effect of excess pension liability | (607) |  |
Reclassification of unrecognized tax benefits | (8,576) |  |
Reclassification of unrecognized tax benefits | 8,576 |  |
Other | (305) |  |
Deferred income taxes | (2,836) | 55,787 | 50,043
Texas-New Mexico Power Company [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | 21,244 |  |
Change in tax effects of income tax related regulatory assets and liabilities | (111) |  |
Other | (250) |  |
Deferred income taxes | $ 20,883 | $ 20,549 | $ 20,662

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