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Fair Value of Derivative and Other Financial Instruments - Items Recorded and Presented by Level of Hierarchy (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
PNMR and PNM |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | $ 286,099 | $ 272,977
PNMR and PNM | Cash and cash equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 8,047 | 23,683
PNMR and PNM | Domestic value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 70,043 | 34,796
PNMR and PNM | Domestic growth |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 65,127 | 47,595
PNMR and PNM | International and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 36,442 | 27,481
PNMR and PNM | U.S. Government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 31,410 | 40,962
PNMR and PNM | Municipals |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 33,218 | 43,789
PNMR and PNM | Corporate and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 41,812 | 54,671
PNMR |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 2,525,916 | 2,540,693
Westmoreland Loan | 96,444 |
Westmoreland Loan |  | 100,893
Other investments | 1,051 | 1,164
PNMR | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 0 | 0
Westmoreland Loan | 0 |
Westmoreland Loan |  | 0
Other investments | 419 | 547
PNMR | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 2,525,916 | 2,540,693
Westmoreland Loan | 0 |
Westmoreland Loan |  | 0
Other investments | 0 | 0
PNMR | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 0 | 0
Westmoreland Loan | 96,444 |
Westmoreland Loan |  | 100,893
Other investments | 632 | 617
PNMR | Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 2,384,160 | 2,392,712
Westmoreland Loan | 85,410 |
Westmoreland Loan |  | 95,000
Other investments | 419 | 547
PNM |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 1,728,276 | 1,730,157
Other investments | 188 | 316
PNM | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 0 | 0
Other investments | 188 | 316
PNM | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 1,728,276 | 1,730,157
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 | 1,631,972 | 1,631,369
Other investments | 188 | 316
TNMP |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 464,877 | 468,329
Other investments | 231 | 231
TNMP | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 0 | 0
Other investments | 231 | 231
TNMP | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 464,877 | 468,329
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 | 420,950 | 420,875
Other investments | 231 | 231
Fair Value, Measurements, Recurring | PNMR and PNM |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 286,099 | 272,977
Fair Value, Measurements, Recurring | PNMR and PNM | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 206,608 | 196,436
Fair Value, Measurements, Recurring | PNMR and PNM | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 79,491 | 76,541
Fair Value, Measurements, Recurring | PNMR and PNM | Commodity derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Commodity derivative assets | 4,586 | 5,224
Commodity derivative liabilities | (360) | (2,339)
Net | 4,226 | 2,885
Fair Value, Measurements, Recurring | PNMR and 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
Fair Value, Measurements, Recurring | PNMR and PNM | Commodity derivatives | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Commodity derivative assets | 4,586 | 5,224
Commodity derivative liabilities | (360) | (2,339)
Net | 4,226 | 2,885
Fair Value, Measurements, Recurring | PNMR and PNM | Cash and cash equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 8,047 | 23,683
Fair Value, Measurements, Recurring | PNMR and PNM | Cash and cash equivalents | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 8,047 | 23,683
Fair Value, Measurements, Recurring | PNMR and PNM | Cash and cash equivalents | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 0 | 0
Fair Value, Measurements, Recurring | PNMR and PNM | Domestic value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 70,043 | 34,796
Fair Value, Measurements, Recurring | PNMR and PNM | Domestic value | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 70,043 | 34,796
Fair Value, Measurements, Recurring | PNMR and PNM | Domestic value | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 0 | 0
Fair Value, Measurements, Recurring | PNMR and PNM | Domestic growth |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 65,127 | 47,595
Fair Value, Measurements, Recurring | PNMR and PNM | Domestic growth | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 65,127 | 47,595
Fair Value, Measurements, Recurring | PNMR and PNM | Domestic growth | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 0 | 0
Fair Value, Measurements, Recurring | PNMR and PNM | International and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 36,442 | 27,481
Fair Value, Measurements, Recurring | PNMR and PNM | International and other | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 33,212 | 27,481
Fair Value, Measurements, Recurring | PNMR and PNM | International and other | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 3,230 | 0
Fair Value, Measurements, Recurring | PNMR and PNM | U.S. Government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 31,410 | 40,962
Fair Value, Measurements, Recurring | PNMR and PNM | U.S. Government | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 30,179 | 39,723
Fair Value, Measurements, Recurring | PNMR and PNM | U.S. Government | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 1,231 | 1,239
Fair Value, Measurements, Recurring | PNMR and PNM | Municipals |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 33,218 | 43,789
Fair Value, Measurements, Recurring | PNMR and PNM | Municipals | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 0 | 0
Fair Value, Measurements, Recurring | PNMR and PNM | Municipals | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 33,218 | 43,789
Fair Value, Measurements, Recurring | PNMR and PNM | Corporate and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 41,812 | 54,671
Fair Value, Measurements, Recurring | PNMR and PNM | Corporate and other | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 0 | 23,158
Fair Value, Measurements, Recurring | PNMR and PNM | Corporate and other | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | $ 41,812 | $ 31,513

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