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Fair Value of Derivative and Other Financial Instruments - Items Recorded and Presented by Level of Hierarchy (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Transfers between levels | $ 0 | $ 0
Long-term debt | 3,023,159,000 | 2,703,810,000
Other investments | 299,000 | 297,000
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 0 | 0
Other investments | 299,000 | 297,000
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 3,023,159,000 | 2,703,810,000
Other investments | 0 | 0
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 0 | 0
Other investments | 0 | 0
Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 2,944,241,000 | 2,670,111,000
Other investments | 299,000 | 297,000
PNM |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 1,744,864,000 | 1,668,736,000
Other investments | 93,000 | 91,000
PNM | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 0 | 0
Other investments | 93,000 | 91,000
PNM | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 1,744,864,000 | 1,668,736,000
Other investments | 0 | 0
PNM | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 0 | 0
Other investments | 0 | 0
PNM | Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 1,706,873,000 | 1,656,490,000
Other investments | 93,000 | 91,000
TNMP |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 838,705,000 | 597,236,000
Other investments | 206,000 | 206,000
TNMP | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 0 | 0
Other investments | 206,000 | 206,000
TNMP | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 838,705,000 | 597,236,000
Other investments | 0 | 0
TNMP | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 0 | 0
Other investments | 0 | 0
TNMP | Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 798,941,000 | 575,398,000
Other investments | 206,000 | 206,000
Recurring | PNM |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | 351,563,000 | 328,242,000
Recurring | PNM | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | 152,868,000 | 136,150,000
Recurring | PNM | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | 196,608,000 | 189,936,000
Recurring | PNM | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | 2,087,000 | 2,156,000
Investments, unrealized gain | 9,002,000 | 2,600,000
Recurring | PNM | Commodity derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Commodity derivative assets | 3,351,000 | 3,594,000
Commodity derivative liabilities | (3,415,000) | (3,688,000)
Net | (64,000) | (94,000)
Recurring | PNM | Commodity derivatives | Level 1 |  |
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
Recurring | PNM | Commodity derivatives | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Commodity derivative assets | 3,351,000 | 3,594,000
Commodity derivative liabilities | (3,415,000) | (3,688,000)
Net | (64,000) | (94,000)
Recurring | PNM | Commodity derivatives | Level 3 |  |
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
Recurring | PNM | Cash and cash equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 10,339,000 | 11,472,000
Recurring | PNM | Cash and cash equivalents | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 10,339,000 | 11,472,000
Recurring | PNM | Cash and cash equivalents | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 0 | 0
Recurring | PNM | Cash and cash equivalents | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 0 | 0
Recurring | PNM | Corporate stocks, common |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 36,025,000 | 32,997,000
Recurring | PNM | Corporate stocks, common | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 36,025,000 | 32,997,000
Recurring | PNM | Corporate stocks, common | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 0 | 0
Recurring | PNM | Corporate stocks, common | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 0 | 0
Recurring | PNM | Corporate stocks, preferred |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 8,138,000 | 7,258,000
Recurring | PNM | Corporate stocks, preferred | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 1,854,000 | 1,654,000
Recurring | PNM | Corporate stocks, preferred | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 6,284,000 | 5,604,000
Recurring | PNM | Corporate stocks, preferred | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 0 | 0
Recurring | PNM | Mutual funds and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 78,699,000 | 70,777,000
Recurring | PNM | Mutual funds and other | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 78,688,000 | 70,777,000
Recurring | PNM | Mutual funds and other | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 11,000 | 0
Recurring | PNM | Mutual funds and other | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 0 | 0
Recurring | PNM | Corporate stocks, common | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, unrealized gain |  |
Recurring | PNM | Corporate stocks, preferred | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, unrealized gain |  |
Recurring | PNM | Mutual funds and other | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, unrealized gain |  |
Recurring | PNM | U.S. Government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | 36,153,000 | 29,503,000
Recurring | PNM | U.S. Government | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | 25,074,000 | 18,662,000
Recurring | PNM | U.S. Government | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | 11,079,000 | 10,841,000
Recurring | PNM | U.S. Government | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | 0 | 0
Investments, unrealized gain | 1,489,000 | 1,098,000
Recurring | PNM | International Government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | 11,577,000 | 8,435,000
Recurring | PNM | International Government | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | 46,000 | 0
Recurring | PNM | International Government | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | 11,531,000 | 8,435,000
Recurring | PNM | International Government | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | 0 | 0
Investments, unrealized gain | 345,000 | 90,000
Recurring | PNM | Municipals |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | 49,160,000 | 53,642,000
Recurring | PNM | Municipals | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | 0 | 0
Recurring | PNM | Municipals | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | 49,160,000 | 53,642,000
Recurring | PNM | Municipals | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | 0 | 0
Investments, unrealized gain | 1,337,000 | 489,000
Recurring | PNM | Corporate and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | 121,472,000 | 114,158,000
Recurring | PNM | Corporate and other | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | 842,000 | 588,000
Recurring | PNM | Corporate and other | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | 118,543,000 | 111,414,000
Recurring | PNM | Corporate and other | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | 2,087,000 | 2,156,000
Investments, unrealized gain | $ 5,831,000 | $ 923,000

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