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Stockholders' Equity (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Class of Stock [Line Items] |  |  |
Payment of dividends | $ 133,900 |  |
Line of Credit |  |  |
Class of Stock [Line Items] |  |  |
Debt-to-capital ratio (not more than) | 65.00% |  |
Public Service Company of New Mexico |  |  |
Class of Stock [Line Items] |  |  |
Equity contribution from parent | $ 0 | $ 28,142 | $ 175,000
Payment of dividends | $ 246,100 |  |
Preferred stock, dividend rate | 4.58% |  |
Preferred stock, redemption percent | 102.00% |  |
Preferred stock outstanding (in shares) | 115,293 | 115,293 |
Preferred stock, cumulative shares authorized (in shares) | 10,000,000 | 10,000,000 |
Public Service Company of New Mexico | Maximum |  |  |
Class of Stock [Line Items] |  |  |
Requirement to obtain approval to transfer more than a percentage of PNM's assets | 5.00% |  |
Public Service Company of New Mexico | Affiliated Entity |  |  |
Class of Stock [Line Items] |  |  |
Cash dividends paid to parent company by consolidated subsidiaries | $ 60,700 | $ 4,100 | 94,400
Texas-New Mexico Power Company |  |  |
Class of Stock [Line Items] |  |  |
Equity contribution from parent | $ 50,000 | 50,000 | 0
Preferred stock, cumulative shares authorized (in shares) | 1,000,000 |  |
Texas-New Mexico Power Company | Line of Credit |  |  |
Class of Stock [Line Items] |  |  |
Debt-to-capital ratio (not more than) | 65.00% |  |
Texas-New Mexico Power Company | Affiliated Entity |  |  |
Class of Stock [Line Items] |  |  |
Cash dividends paid to parent company by consolidated subsidiaries | $ 44,400 | $ 31,800 | $ 33,200
PNMR and TNMP |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock outstanding (in shares) | 0 |  |

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