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Fair Value of Derivative and Other Financial Instruments - Items Recorded at Fair Value (Details) - PNMR and PNM - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | $ 323,524 | $ 272,977
Cash and cash equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 52,636 | 23,683
Domestic value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 40,032 | 34,796
Domestic growth |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 35,456 | 47,595
International and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 45,867 | 27,481
U.S. Government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 34,317 | 40,962
Municipals |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 48,076 | 43,789
Corporate and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 67,140 | 54,671
Measured on a recurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 323,524 | 272,977
Measured on a recurring basis | Commodity Contract |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Commodity derivative assets | 4,644 | 5,224
Commodity derivative liabilities | (4,738) | (2,339)
Net | (94) | 2,885
Measured on a recurring basis | Cash and cash equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 52,636 | 23,683
Measured on a recurring basis | Domestic value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 40,032 | 34,796
Measured on a recurring basis | Domestic growth |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 35,456 | 47,595
Measured on a recurring basis | International and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 45,867 | 27,481
Measured on a recurring basis | U.S. Government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 34,317 | 40,962
Measured on a recurring basis | Municipals |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 48,076 | 43,789
Measured on a recurring basis | Corporate and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 67,140 | 54,671
Measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 204,101 | 196,436
Measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commodity Contract |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Commodity derivative assets | 0 | 0
Commodity derivative liabilities | 0 | 0
Net | 0 | 0
Measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and cash equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 52,636 | 23,683
Measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Domestic value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 40,032 | 34,796
Measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Domestic growth |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 35,456 | 47,595
Measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | International and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 42,332 | 27,481
Measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 33,645 | 39,723
Measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipals |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 23,158
Measured on a recurring basis | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 119,423 | 76,541
Measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Commodity Contract |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Commodity derivative assets | 4,644 | 5,224
Commodity derivative liabilities | (4,738) | (2,339)
Net | (94) | 2,885
Measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Cash and cash equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Domestic value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Domestic growth |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Measured on a recurring basis | Significant Other Observable Inputs (Level 2) | International and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 3,535 | 0
Measured on a recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 672 | 1,239
Measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Municipals |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 48,076 | 43,789
Measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Corporate and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | $ 67,140 | $ 31,513

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