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Condensed Consolidated Statements of Changes in Equity (USD $) In Thousands, unless otherwise specified | Total | Common Stock [Member] | AOCI [Member] | Retained Earnings [Member] | Total Company Common Stockholders' Equity [Member] | Non-controlling Interest in Valencia [Member] | Public Service Company of New Mexico [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] Total Company Common Stockholders' Equity [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] AOCI [Member] | Texas-New Mexico Power Company [Member] Retained Earnings [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2012 | $ 1,689,030 | $ 1,182,819 | $ (81,630) | $ 506,998 | $ 1,608,187 | $ 80,843 | $ 1,334,906 | $ 1,061,776 | $ (81,414) | $ 273,701 | $ 1,254,063 | $ 80,843 |  |  |  |  |
Balance TNMP at Dec. 31, 2012 | 1,608,187 |  |  |  |  |  | 1,254,063 |  |  |  |  |  | 463,814 | 64 | 390,366 | (216) | 73,600
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from stock option exercise | 11,345 | 11,345 | 0 | 0 | 11,345 | 0 |  |  |  |  |  |  |  |  |  |  |
Awards of common stock | (19,741) | (19,741) | 0 | 0 | (19,741) | 0 |  |  |  |  |  |  |  |  |  |  |
Excess tax (shortfall) from stock-based payment arrangements | (458) | (458) | 0 | 0 | (458) | 0 |  |  |  |  |  |  |  |  |  |  |
Stock based compensation expense | 3,198 | 3,198 | 0 | 0 | 3,198 | 0 |  |  |  |  |  |  |  |  |  |  |
Valencia's transactions with its owner | (8,675) | 0 | 0 | 0 | 0 | (8,675) | (8,675) | 0 | 0 | 0 | 0 | (8,675) |  |  |  |  |
Net Earnings | 38,304 |  |  |  |  |  | 37,693 |  |  |  |  |  | 12,065 | 0 | 0 | 0 | 12,065
Net earnings before subsidiary preferred stock dividends | 45,345 | 0 | 0 | 38,568 | 38,568 | 6,777 | 44,470 | 0 | 0 | 37,693 | 37,693 | 6,777 |  |  |  |  |
Subsidiary preferred stock dividends | (264) | 0 | 0 | (264) | (264) | 0 |  |  |  |  |  |  |  |  |  |  |
Total other comprehensive income (loss) | 3,036 | 0 | 3,036 | 0 | 3,036 | 0 | 2,970 | 0 | 2,970 | 0 | 2,970 | 0 | 66 | 0 | 0 | 66 | 0
Dividends declared on preferred stock |  |  |  |  |  |  | (264) | 0 | 0 | (264) | (264) | 0 |  |  |  |  |
Dividends declared on common stock | (13,142) | 0 | 0 | (13,142) | (13,142) | 0 | 0 |  |  |  |  |  | (3,726) | 0 | 0 | 0 | (3,726)
Balance at Jun. 30, 2013 | 1,709,674 | 1,177,163 | (78,594) | 532,160 | 1,630,729 | 78,945 | 1,373,407 | 1,061,776 | (78,444) | 311,130 | 1,294,462 | 78,945 |  |  |  |  |
Balance at Mar. 31, 2013 | 1,709,674 |  |  |  |  |  | 1,373,407 |  |  |  |  |  |  |  |  |  |
Balance TNMP at Mar. 31, 2013 | 1,630,729 |  |  |  |  |  | 1,294,462 |  |  |  |  |  | 472,219 | 64 | 390,366 | (150) | 81,939
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Earnings | 27,678 |  |  |  |  |  | 26,124 |  |  |  |  |  | 8,339 |  |  |  |
Net earnings before subsidiary preferred stock dividends | 31,383 |  |  |  |  |  | 29,697 |  |  |  |  |  |  |  |  |  |
Subsidiary preferred stock dividends | (132) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total other comprehensive income (loss) | (1,903) |  |  |  |  |  | (1,930) |  |  |  |  |  | 27 |  |  |  |
Balance at Jun. 30, 2013 | $ 1,709,674 |  |  |  |  |  | $ 1,373,407 |  |  |  |  |  |  |  |  |  |

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