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Fair Value of Derivative and Other Financial Instruments - Commodity Derivatives (Details) - USD ($) | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Current assets | $ 3,949,000 | $ 3,813,000
Deferred charges | 747,000 | 2,622,000
Current liabilities | (2,423,000) | (1,859,000)
Long-term liabilities | (58,000) | 0
PNMR and PNM [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Amounts recognized for the right to reclaim cash collateral | 0 | 0
Amounts posted as cash collateral under margin arrangements | 3,000,000 | 2,700,000
Obligations to return cash collateral | 100,000 | 100,000
PNMR and PNM [Member] | Designated as Hedging Instrument [Member] | Commodity Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Current assets | 3,949,000 | 3,813,000
Deferred charges | 747,000 | 2,622,000
Commodity derivative instruments, Assets | 4,696,000 | 6,435,000
Current liabilities | (2,423,000) | (1,859,000)
Long-term liabilities | (58,000) | 0
Commodity derivative instruments, Liabilities | (2,481,000) | (1,859,000)
Net | 2,215,000 | 4,576,000
PNMR and PNM [Member] | Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Palo Verde Nuclear Generating Station [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Current assets | 2,700,000 | 3,000,000
Deferred charges | 600,000 | 2,600,000
Public Service Company of New Mexico [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Current assets | 3,949,000 | 3,813,000
Deferred charges | 747,000 | 2,622,000
Current liabilities | (2,423,000) | (1,859,000)
Long-term liabilities | (58,000) | 0
Public Service Company of New Mexico [Member] | Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Fuel and Purchased Power Adjustment Clause [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Current assets | 100,000 | 400,000
Deferred charges | 100,000 |
Current liabilities | $ (100,000) | $ (200,000)

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