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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, 2015 | Dec. 31, 2014
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | $ 259,042 | $ 250,145
Cash and equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 10,700 | 8,276
Domestic value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 44,505 | 45,340
Domestic growth [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 61,078 | 74,053
International and other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 27,961 | 16,599
U.S. Government [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 27,880 | 22,563
Municipals [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 58,576 | 68,973
Corporate and other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 28,342 | 14,341
Measured on a recurring basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 259,042 | 250,145
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 | 6,435 | 11,232
Commodity derivative liabilities | (1,859) | (1,686)
Commodity derivative instruments, Net | 4,576 | 9,546
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 | 10,700 | 8,276
Measured on a recurring basis [Member] | Domestic value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 44,505 | 45,340
Measured on a recurring basis [Member] | Domestic growth [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 61,078 | 74,053
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 | 27,961 | 16,599
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 | 27,880 | 22,563
Measured on a recurring basis [Member] | Municipals [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 58,576 | 68,973
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 | 28,342 | 14,341
Measured on a recurring basis [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 177,352 | 169,919
Measured on a recurring basis [Member] | 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
Commodity derivative instruments, Net | 0 | 0
Measured on a recurring basis [Member] | Level 1 [Member] | Cash and equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 10,700 | 8,276
Measured on a recurring basis [Member] | Level 1 [Member] | Domestic value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 44,505 | 45,340
Measured on a recurring basis [Member] | Level 1 [Member] | Domestic growth [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 61,078 | 74,053
Measured on a recurring basis [Member] | Level 1 [Member] | International and other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 27,961 | 16,599
Measured on a recurring basis [Member] | Level 1 [Member] | U.S. Government [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 26,608 | 20,808
Measured on a recurring basis [Member] | 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] | Level 1 [Member] | Corporate and other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 6,500 | 4,843
Measured on a recurring basis [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 81,690 | 80,226
Measured on a recurring basis [Member] | Level 2 [Member] | Commodity Contract [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Commodity derivative assets | 6,435 | 11,232
Commodity derivative liabilities | (1,859) | (1,686)
Commodity derivative instruments, Net | 4,576 | 9,546
Measured on a recurring basis [Member] | 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] | 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] | 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] | 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] | Level 2 [Member] | U.S. Government [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 1,272 | 1,755
Measured on a recurring basis [Member] | Level 2 [Member] | Municipals [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 58,576 | 68,973
Measured on a recurring basis [Member] | Level 2 [Member] | Corporate and other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | $ 21,842 | $ 9,498

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