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Fair Value of Derivative and Other Financial Instruments - Commodity Derivatives (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Current assets | $ 5,224,000 | $ 3,813,000
Deferred charges | 0 | 2,622,000
Current liabilities | (2,339,000) | (1,859,000)
PNMR and PNM [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Amounts recognized for the legal right to reclaim cash collateral | 0 | 0
Amounts posted as cash collateral under margin arrangements | 2,600,000 | 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 | 5,224,000 | 3,813,000
Deferred charges | 0 | 2,622,000
Total assets | 5,224,000 | 6,435,000
Current liabilities | (2,339,000) | (1,859,000)
Net | 2,885,000 | 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 |  | 2,600,000
Public Service Company of New Mexico [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Current assets | 5,224,000 | 3,813,000
Deferred charges | 0 | 2,622,000
Current liabilities | (2,339,000) | (1,859,000)
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 | 200,000 | 400,000
Current liabilities | $ (100,000) | $ (200,000)

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