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Fair Value of Derivative and Other Financial Instruments - Non-Derivative Financial Instruments (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items] |  |  |
Realized impairment loss | $ (1,200,000) | $ (4,300,000) | $ (700,000)
PNMR and PNM [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 272,977,000 | 259,042,000 |
Unrealized Gains | 7,449,000 | 28,820,000 |
Proceeds from sales | 522,601,000 | 252,174,000 | 117,989,000
Gross realized gains | 46,116,000 | 29,663,000 | 15,162,000
Gross realized (losses) | (25,430,000) | (9,259,000) | $ (3,964,000)
Value of other than temporary impairments | 0 |  |
PNMR and PNM [Member] | Cash and equivalents [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 23,683,000 | 10,700,000 |
Unrealized Gains | 0 | 0 |
PNMR and PNM [Member] | Domestic value [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 34,796,000 | 44,505,000 |
Unrealized Gains | 1,135,000 | 11,610,000 |
PNMR and PNM [Member] | Domestic growth [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 47,595,000 | 61,078,000 |
Unrealized Gains | 3,032,000 | 11,163,000 |
PNMR and PNM [Member] | International and other [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 27,481,000 | 27,961,000 |
Unrealized Gains | 2,029,000 | 1,569,000 |
PNMR and PNM [Member] | U.S. Government [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 40,962,000 | 27,880,000 |
Unrealized Gains | 115,000 | 178,000 |
PNMR and PNM [Member] | Municipals [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 43,789,000 | 58,576,000 |
Unrealized Gains | 585,000 | 3,672,000 |
PNMR and PNM [Member] | Corporate and other [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 54,671,000 | 28,342,000 |
Unrealized Gains | 553,000 | 628,000 |
PNMR and PNM [Member] | Measured on a recurring basis [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 272,977,000 | 259,042,000 |
PNMR and PNM [Member] | Measured on a recurring basis [Member] | Nuclear Decommissioning Trust [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 253,900,000 | 249,100,000 |
PNMR and PNM [Member] | Measured on a recurring basis [Member] | Mine Reclamation Trust [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 19,100,000 | 9,900,000 |
PNMR and PNM [Member] | Measured on a recurring basis [Member] | Cash and equivalents [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 23,683,000 | 10,700,000 |
PNMR and PNM [Member] | Measured on a recurring basis [Member] | Domestic value [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 34,796,000 | 44,505,000 |
PNMR and PNM [Member] | Measured on a recurring basis [Member] | Domestic growth [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 47,595,000 | 61,078,000 |
PNMR and PNM [Member] | Measured on a recurring basis [Member] | International and other [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 27,481,000 | 27,961,000 |
PNMR and PNM [Member] | Measured on a recurring basis [Member] | U.S. Government [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 40,962,000 | 27,880,000 |
PNMR and PNM [Member] | Measured on a recurring basis [Member] | Municipals [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 43,789,000 | 58,576,000 |
PNMR and PNM [Member] | Measured on a recurring basis [Member] | Corporate and other [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | $ 54,671,000 | $ 28,342,000 |

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