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Fair Value of Derivative and Other Financial Instruments - Items Recorded at Fair Value (Details) - PNMR and PNM [Member] - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | $ 272,977 | $ 259,042
Cash and equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 23,683 | 10,700
Domestic value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 34,796 | 44,505
Domestic growth [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 47,595 | 61,078
International and other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 27,481 | 27,961
U.S. Government [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 40,962 | 27,880
Municipals [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 43,789 | 58,576
Corporate and other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 54,671 | 28,342
Measured on a recurring basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 272,977 | 259,042
Measured on a recurring basis [Member] | Commodity Contract [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Commodity derivative assets | 5,224 | 6,435
Commodity derivative liabilities | (2,339) | (1,859)
Net | 2,885 | 4,576
Measured on a recurring basis [Member] | Cash and equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 23,683 | 10,700
Measured on a recurring basis [Member] | Domestic value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 34,796 | 44,505
Measured on a recurring basis [Member] | Domestic growth [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 47,595 | 61,078
Measured on a recurring basis [Member] | International and other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 27,481 | 27,961
Measured on a recurring basis [Member] | U.S. Government [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 40,962 | 27,880
Measured on a recurring basis [Member] | Municipals [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 43,789 | 58,576
Measured on a recurring basis [Member] | Corporate and other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 54,671 | 28,342
Measured on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member} |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 196,436 | 177,352
Measured on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member} | Commodity Contract [Member] |  |
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 [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member} | Cash and equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 23,683 | 10,700
Measured on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member} | Domestic value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 34,796 | 44,505
Measured on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member} | Domestic growth [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 47,595 | 61,078
Measured on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member} | International and other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 27,481 | 27,961
Measured on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member} | U.S. Government [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 39,723 | 26,608
Measured on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member} | Municipals [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Measured on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member} | Corporate and other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 23,158 | 6,500
Measured on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 76,541 | 81,690
Measured on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commodity Contract [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Commodity derivative assets | 5,224 | 6,435
Commodity derivative liabilities | (2,339) | (1,859)
Net | 2,885 | 4,576
Measured on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Cash and equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Measured on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Domestic value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Measured on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Domestic growth [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Measured on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | International and other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Measured on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Government [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 1,239 | 1,272
Measured on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Municipals [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 43,789 | 58,576
Measured on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate and other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | $ 31,513 | $ 21,842

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