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Significant Accounting Policies and Responsibility for Financial Statements (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 31, 2016 | Jul. 31, 2015 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Dividends Payable [Line Items] |  |  |  |  |  |  |
Dividends declared on common stock (in dollars per share) |  | $ 0.20 |  | $ 0.220 | $ 0.200 | $ 0.44 | $ 0.400
Dividends declared on common stock |  |  |  |  |  | $ 17,524 |
Subsequent Event [Member] |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Dividends declared on common stock (in dollars per share) | $ 0.22 |  |  |  |  |  |
Public Service Company of New Mexico [Member] |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Equity contribution from parent |  |  |  |  |  | 4,142 |
Dividends declared on common stock |  |  | $ 20,000 |  |  | 4,142 |
Texas-New Mexico Power Company [Member] |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Dividends declared on common stock |  |  | $ 7,700 |  |  | 7,456 |
Common Stock [Member] | Public Service Company of New Mexico [Member] |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Equity contribution from parent |  |  |  |  |  | $ 4,142 |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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