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Fair Value of Derivative and Other Financial Instruments - Statement of Earnings Information (Details) - PNM - Designated as Hedging Instrument - Commodity derivatives - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total gain (loss) | $ (694) | $ (5,090) | $ 2,657 | $ (2,551)
Electric operating revenues |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total gain (loss) | 4,592 | (4,123) | 7,933 | (1,439)
Cost of energy |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total gain (loss) | $ (5,286) | $ (967) | $ (5,276) | $ (1,112)

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