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Fair Value of Derivative and Other Financial Instruments - Available for Sale Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities | $ 1,200 | $ (100) | $ 800 | $ (600) |
PNMR and PNM [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 253,550 |  | 253,550 |  | $ 250,145
Available-for-sale Securities, Gross Unrealized Gain | 39,797 |  | 39,797 |  | 46,348
Proceeds from sales | 62,670 | 30,316 | 94,522 | 53,119 |
Gross realized gains | 8,329 | 5,364 | 13,465 | 8,482 |
Gross realized (losses) | (1,578) | $ (755) | (3,119) | $ (1,794) |
PNMR and PNM [Member] | Cash and equivalents [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 3,940 |  | 3,940 |  | 8,276
Available-for-sale Securities, Gross Unrealized Gain | 0 |  | 0 |  | 0
PNMR and PNM [Member] | Domestic value [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 45,750 |  | 45,750 |  | 45,340
Available-for-sale Securities, Gross Unrealized Gain | 15,015 |  | 15,015 |  | 17,418
PNMR and PNM [Member] | Domestic growth [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 78,515 |  | 78,515 |  | 74,053
Available-for-sale Securities, Gross Unrealized Gain | 19,850 |  | 19,850 |  | 21,354
PNMR and PNM [Member] | International and other [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 17,057 |  | 17,057 |  | 16,599
Available-for-sale Securities, Gross Unrealized Gain | 1,147 |  | 1,147 |  | 156
PNMR and PNM [Member] | U.S. Government [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 30,421 |  | 30,421 |  | 22,563
Available-for-sale Securities, Gross Unrealized Gain | 276 |  | 276 |  | 903
PNMR and PNM [Member] | Municipals [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 58,986 |  | 58,986 |  | 68,973
Available-for-sale Securities, Gross Unrealized Gain | 3,098 |  | 3,098 |  | 5,851
PNMR and PNM [Member] | Corporate and other [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 18,881 |  | 18,881 |  | 14,341
Available-for-sale Securities, Gross Unrealized Gain | 411 |  | 411 |  | 666
Fair Value, Measurements, Recurring [Member] | PNMR and PNM [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 253,550 |  | 253,550 |  | 250,145
Fair Value, Measurements, Recurring [Member] | PNMR and PNM [Member] | Nuclear Decommissioning Trust [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 247,800 |  | 247,800 |  | 244,600
Fair Value, Measurements, Recurring [Member] | PNMR and PNM [Member] | Mine Reclamation Trust [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 5,700 |  | 5,700 |  | 5,500
Fair Value, Measurements, Recurring [Member] | PNMR and PNM [Member] | Cash and equivalents [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 3,940 |  | 3,940 |  | 8,276
Fair Value, Measurements, Recurring [Member] | PNMR and PNM [Member] | Domestic value [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 45,750 |  | 45,750 |  | 45,340
Fair Value, Measurements, Recurring [Member] | PNMR and PNM [Member] | Domestic growth [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 78,515 |  | 78,515 |  | 74,053
Fair Value, Measurements, Recurring [Member] | PNMR and PNM [Member] | International and other [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 17,057 |  | 17,057 |  | 16,599
Fair Value, Measurements, Recurring [Member] | PNMR and PNM [Member] | U.S. Government [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 30,421 |  | 30,421 |  | 22,563
Fair Value, Measurements, Recurring [Member] | PNMR and PNM [Member] | Municipals [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 58,986 |  | 58,986 |  | 68,973
Fair Value, Measurements, Recurring [Member] | PNMR and PNM [Member] | Corporate and other [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | $ 18,881 |  | $ 18,881 |  | $ 14,341

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