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Fair Value of Derivative and Other Financial Instruments - Items not Recorded at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
PNMR [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | $ 2,540,693 | $ 2,264,869
Westmoreland Loan | 100,893 |
Investment in PVNGS lessor notes |  | 8,947
Other investments | 1,164 | 1,269
PNMR [Member] | Carrying Amount [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 2,392,712 | 2,091,948
Westmoreland Loan | 95,000 |
Investment in PVNGS lessor notes |  | 8,587
Other investments | 547 | 604
PNMR [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member} |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 0 | 0
Westmoreland Loan | 0 |
Investment in PVNGS lessor notes |  | 0
Other investments | 547 | 604
PNMR [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 2,540,693 | 2,264,869
Westmoreland Loan | 0 |
Investment in PVNGS lessor notes |  | 0
Other investments | 0 | 0
PNMR [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 0 | 0
Westmoreland Loan | 100,893 |
Investment in PVNGS lessor notes |  | 8,947
Other investments | 617 | 665
Public Service Company of New Mexico [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 1,730,157 | 1,703,209
Investment in PVNGS lessor notes |  | 8,947
Other investments | 316 | 366
Public Service Company of New Mexico [Member] | Carrying Amount [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 1,631,369 | 1,580,677
Investment in PVNGS lessor notes |  | 8,587
Other investments | 316 | 366
Public Service Company of New Mexico [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member} |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 0 | 0
Investment in PVNGS lessor notes |  | 0
Other investments | 316 | 366
Public Service Company of New Mexico [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 1,730,157 | 1,703,209
Investment in PVNGS lessor notes |  | 0
Other investments | 0 | 0
Public Service Company of New Mexico [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 0 | 0
Investment in PVNGS lessor notes |  | 8,947
Other investments | 0 | 0
Texas-New Mexico Power Company [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 468,329 | 411,661
Other investments | 231 | 238
Texas-New Mexico Power Company [Member] | Carrying Amount [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 420,875 | 361,411
Other investments | 231 | 238
Texas-New Mexico Power Company [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member} |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 0 | 0
Other investments | 231 | 238
Texas-New Mexico Power Company [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 468,329 | 411,661
Other investments | 0 | 0
Texas-New Mexico Power Company [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 0 | 0
Other investments | $ 0 | $ 0

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