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Fair Value of Derivative and Other Financial Instruments - Overview and Commodity Derivatives (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) MW | Mar. 31, 2017 USD ($) | Jan. 01, 2018 USD ($) | Dec. 31, 2017 USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |
Current assets | $ 1,087,000 |  |  | $ 1,088,000
Deferred charges | 3,277,000 |  |  | 3,556,000
Current liabilities | (1,328,000) |  |  | (1,182,000)
Long-term liabilities | (3,277,000) |  |  | (3,556,000)
Obligations to return cash | 900,000 |  |  | 900,000
Net liability contracts | $ 100,000 |  |  | 0
Cumulative effect adjustment |  |  |  | (11,208,000)
PNM |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Expected exposure to market risk (in megawatts) | MW | 65 |  |  |
Power to be sold to third party (in megawatts) | MW | 36 |  |  |
Current assets | $ 1,087,000 |  |  | 1,088,000
Deferred charges | 3,277,000 |  |  | 3,556,000
Current liabilities | (1,328,000) |  |  | (1,182,000)
Long-term liabilities | (3,277,000) |  |  | (3,556,000)
Amounts recognized for right to reclaim cash | 0 |  |  | 0
Cash collateral under margin arrangements | 500,000 |  |  | 800,000
Cumulative effect adjustment |  |  |  | (11,208,000)
(Increase)/decrease in other than temporary losses of available-for-sale securities, net portion recognized in earnings | (1,200,000) | $ 1,100,000 |  |
PNM | Designated as Hedging Instrument | Commodity derivatives |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Current assets | 1,087,000 |  |  | 1,088,000
Deferred charges | 3,277,000 |  |  | 3,556,000
Derivative Asset | 4,364,000 |  |  | 4,644,000
Current liabilities | (1,328,000) |  |  | (1,182,000)
Long-term liabilities | (3,277,000) |  |  | (3,556,000)
Derivative Liability | (4,605,000) |  |  | (4,738,000)
Net | (241,000) |  |  | (94,000)
PNM | Designated as Hedging Instrument | Commodity derivatives | Fuel and purchased power costs |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Current assets |  |  |  | 0
Current liabilities | (200,000) |  |  |
PNM | Designated as Hedging Instrument | Commodity derivatives | Hazard sharing arrangement |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset | $ 4,400,000 |  |  | 4,600,000
Retained Earnings |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Cumulative effect adjustment |  |  |  | 11,208,000
Retained Earnings | PNM |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Cumulative effect adjustment |  |  |  | $ 11,208,000
Accounting Standards Update 2016-01 | Retained Earnings |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Cumulative effect adjustment |  |  | $ 11,200,000 |

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