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Condensed Consolidated Statement of Changes in Equity - 6 months ended Jun. 30, 2015 - USD ($) $ in Thousands | Total | Parent [Member] | Common Stock [Member] | AOCI [Member] | Retained Earnings [Member] | Non-controlling Interest in Valencia [Member] | Public Service Company of New Mexico [Member] | Public Service Company of New Mexico [Member] Parent [Member] | Public Service Company of New Mexico [Member] Common Stock [Member] | Public Service Company of New Mexico [Member] AOCI [Member] | Public Service Company of New Mexico [Member] Retained Earnings [Member] | Public Service Company of New Mexico [Member] Non-controlling Interest in Valencia [Member] | Texas-New Mexico Power Company [Member] | Texas-New Mexico Power Company [Member] Common Stock [Member] | Texas-New Mexico Power Company [Member] Additional Paid-in Capital [Member] | Texas-New Mexico Power Company [Member] Retained Earnings [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2014 | $ 1,795,092 | $ 1,721,546 | $ 1,173,845 | $ (61,755) | $ 609,456 | $ 73,546 | $ 1,336,402 | $ 1,262,856 | $ 1,061,776 | $ (61,755) | $ 262,835 | $ 73,546 |  |  |  |
Beginning balance TNMP at Dec. 31, 2014 | 1,721,546 |  |  |  |  |  | 1,262,856 |  |  |  |  |  | $ 524,665 | $ 64 | $ 404,166 | $ 120,435
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from stock option exercise | 7,347 | 7,347 | 7,347 |  |  |  |  |  |  |  |  |  |  |  |  |
Awards of common stock | (18,814) | (18,814) | (18,814) |  |  |  |  |  |  |  |  |  |  |  |  |
Excess tax (shortfall) from stock-based payment arrangements | (136) | (136) | (136) |  |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation expense | 2,761 | 2,761 | 2,761 |  |  |  |  |  |  |  |  |  |  |  |  |
Valencia’s transactions with its owner | (7,614) |  |  |  |  | (7,614) | (7,614) |  |  |  |  | (7,614) |  |  |  |
Net Earnings | 53,508 | 46,277 |  |  | 46,277 | 7,231 | 38,866 | 31,635 |  | 0 | 31,635 | $ 7,231 | 19,559 |  |  |
Net earnings | 46,013 |  |  |  |  |  | 31,635 |  |  |  |  |  | 19,559 |  |  | 19,559
Subsidiary preferred stock dividends | (264) | (264) |  |  | (264) |  |  |  |  |  |  |  |  |  |  |
Total other comprehensive income | (2,070) | (2,070) |  | (2,070) |  |  | (2,070) | (2,070) |  | (2,070) | 0 |  | 0 |  |  |
Dividends declared on common stock | (15,931) | (15,931) |  |  | (15,931) |  | (20,000) | (20,000) |  | 0 | (20,000) |  | (7,694) |  |  | (7,694)
Dividends declared on preferred stock |  |  |  |  |  |  | (264) | (264) |  | 0 | (264) |  |  |  |  |
Ending balance at Jun. 30, 2015 | 1,813,879 | $ 1,740,716 | $ 1,165,003 | $ (63,825) | $ 639,538 | $ 73,163 | 1,345,320 | $ 1,272,157 | $ 1,061,776 | $ (63,825) | $ 274,206 | $ 73,163 |  |  |  |
Ending balance TNMP at Jun. 30, 2015 | $ 1,740,716 |  |  |  |  |  | $ 1,272,157 |  |  |  |  |  | $ 536,530 | $ 64 | $ 404,166 | $ 132,300

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