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Condensed Consolidated Statement of Changes in Equity - 9 months ended Sep. 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 | 7,394 | 7,394 | 7,394 |  |  |  |  |  |  |  |  |  |  |  |  |
Awards of common stock | (18,955) | (18,955) | (18,955) |  |  |  |  |  |  |  |  |  |  |  |  |
Excess tax (shortfall) from stock-based payment arrangements | (137) | (137) | (137) |  |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation expense | 3,748 | 3,748 | 3,748 |  |  |  |  |  |  |  |  |  |  |  |  |
Valencia’s transactions with its owner | (12,107) |  |  |  |  | (12,107) | (12,107) |  |  |  |  | (12,107) |  |  |  |
Net Earnings | 118,363 | 107,454 |  |  | 107,454 | 10,909 | 91,923 | 81,014 |  | 0 | 81,014 | $ 10,909 | 33,248 |  |  |
Net earnings | 107,058 |  |  |  |  |  | 81,014 |  |  |  |  |  | 33,248 |  |  | 33,248
Subsidiary preferred stock dividends | (396) | (396) |  |  | (396) |  |  |  |  |  |  |  |  |  |  |
Total other comprehensive income | (9,545) | (9,545) |  | (9,545) |  |  | (9,117) | (9,117) |  | (9,117) | 0 |  | 0 |  |  |
Dividends declared on common stock | (47,792) | (47,792) |  |  | (47,792) |  | (46,152) | (46,152) |  | 0 | (46,152) |  | (19,559) |  |  | (19,559)
Dividends declared on preferred stock |  |  |  |  |  |  | (396) | (396) |  | 0 | (396) |  |  |  |  |
Ending balance at Sep. 30, 2015 | 1,835,665 | $ 1,763,317 | $ 1,165,895 | $ (71,300) | $ 668,722 | $ 72,348 | 1,360,553 | $ 1,288,205 | $ 1,061,776 | $ (70,872) | $ 297,301 | $ 72,348 |  |  |  |
Ending balance TNMP at Sep. 30, 2015 | $ 1,763,317 |  |  |  |  |  | $ 1,288,205 |  |  |  |  |  | $ 538,354 | $ 64 | $ 404,166 | $ 134,124

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