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Consolidated Statements of Changes in Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | AOCI [Member] | Retained Earnings [Member] | Total 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 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] 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 |  |  |  |  |  |  |  |  |  |  |  |  | $ 463,814 | $ 64 | $ 390,366 | $ (216) | $ 73,600
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from stock option exercise | 4,618 | 4,618 |  |  | 4,618 |  |  |  |  |  |  |  |  |  |  |  |
Purchases to satisfy awards of common stock | (13,807) | 13,807 |  |  | (13,807) |  |  |  |  |  |  |  |  |  |  |  |
Net Earnings | 100,507 |  |  |  |  |  | 88,155 |  |  |  |  |  | 29,090 |  |  |  | 29,090
Excess tax (shortfall) from stock-based payment arrangements | (581) | (581) |  |  | (581) |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation expense | 5,320 | 5,320 |  |  | 5,320 |  |  |  |  |  |  |  |  |  |  |  |
Valencia’s transactions with its owner | (18,335) |  |  | 0 | 0 | 18,335 | (18,335) |  | 0 | 0 | 0 |  |  |  |  |  |
Net earnings | 115,556 |  |  | 101,035 | 101,035 | 14,521 | 102,676 |  | 0 | 88,155 | 88,155 | 14,521 |  |  |  |  |
Preferred Stock Dividends Requirements | (528) |  |  | (528) | (528) |  | (528) |  | 0 | (528) | (528) |  |  |  |  |  |
Total other comprehensive income | 23,490 |  | 23,490 | 0 | 23,490 |  | 23,537 |  | 23,537 | 0 | 23,537 |  | (47) |  |  | (47) |
Equity contribution from parent |  |  |  |  |  |  | 0 |  |  |  |  |  | 13,800 |  | 13,800 |  |
Dividends declared on common stock | (54,165) |  |  | (54,165) | (54,165) |  | (155,028) |  | 0 | (155,028) | (155,028) |  | (3,726) |  |  |  | (3,726)
Balance at Dec. 31, 2013 | 1,750,598 | 1,178,369 | (58,140) | 553,340 | 1,673,569 | 77,029 | 1,287,228 | 1,061,776 | (57,877) | 206,300 | 1,210,199 | 77,029 |  |  |  |  |
Balance TNMP at Dec. 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  | 502,931 | 64 | 404,166 | (263) | 98,964
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from stock option exercise | 6,999 | 6,999 |  |  | 6,999 |  |  |  |  |  |  |  |  |  |  |  |
Purchases to satisfy awards of common stock | (17,319) | 17,319 |  |  | (17,319) |  |  |  |  |  |  |  |  |  |  |  |
Net Earnings | 116,254 |  |  |  |  |  | 87,326 |  |  |  |  |  | 37,807 |  |  |  | 37,807
Excess tax (shortfall) from stock-based payment arrangements | (135) | (135) |  |  | (135) |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation expense | 5,931 | 5,931 |  |  | 5,931 |  |  |  |  |  |  |  |  |  |  |  |
Valencia’s transactions with its owner | (17,610) |  |  |  | 0 | 17,610 | (17,610) |  | 0 | 0 | 0 |  |  |  |  |  |
Net earnings | 130,909 |  | 0 | 116,782 | 116,782 | 14,127 | 101,453 |  | 0 | 87,326 | 87,326 | 14,127 |  |  |  |  |
Preferred Stock Dividends Requirements | (528) |  | 0 | (528) | (528) | 0 | (528) |  | 0 | (528) | (528) |  |  |  |  |  |
Total other comprehensive income | (3,615) |  | (3,615) | 0 | (3,615) | 0 | (3,878) |  | (3,878) | 0 | (3,878) |  | 263 |  |  | $ 263 |
Equity contribution from parent |  |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  |
Dividends declared on common stock | (60,138) |  | 0 | (60,138) | (60,138) | 0 | (30,263) |  | 0 | (30,263) | (30,263) |  | (16,336) |  |  |  | (16,336)
Balance at Dec. 31, 2014 | 1,795,092 | 1,173,845 | (61,755) | 609,456 | 1,721,546 | 73,546 | 1,336,402 | 1,061,776 | (61,755) | 262,835 | 1,262,856 | 73,546 |  |  |  |  |
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 | 5,619 | 5,619 |  |  | 5,619 |  |  |  |  |  |  |  |  |  |  |  |
Purchases to satisfy awards of common stock | (17,720) | 17,720 |  |  | (17,720) |  |  |  |  |  |  |  |  |  |  |  |
Net Earnings | 15,640 |  |  |  |  |  | (15,234) |  |  |  |  |  | 41,963 |  |  |  | 41,963
Excess tax (shortfall) from stock-based payment arrangements | (142) | (142) |  |  | (142) |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation expense | 4,863 | 4,863 |  |  | 4,863 |  |  |  |  |  |  |  |  |  |  |  |
Valencia’s transactions with its owner | (17,049) | 0 |  |  | 0 | 17,049 | (17,049) |  |  |  |  |  |  |  |  |  |
Net earnings | 31,078 | 0 |  | 16,168 | 16,168 | 14,910 | (324) |  |  | (15,234) | (15,234) | 14,910 |  |  |  |  |
Preferred Stock Dividends Requirements | (528) | 0 |  | (528) | (528) |  | (528) |  |  | (528) | (528) |  |  |  |  |  |
Total other comprehensive income | (9,677) | 0 | (9,677) | 0 | (9,677) |  | (9,721) |  | (9,721) |  | (9,721) |  | 0 |  |  |  |
Equity contribution from parent |  |  |  |  |  |  | 175,000 | 175,000 |  |  | 175,000 |  | 0 |  |  |  |
Dividends declared on common stock | (65,316) | 0 | 0 | (65,316) | (65,316) |  | (94,440) |  |  | (94,440) | (94,440) |  | (33,248) |  |  |  | (33,248)
Balance at Dec. 31, 2015 | 1,726,220 | $ 1,166,465 | $ (71,432) | $ 559,780 | $ 1,654,813 | $ 71,407 | 1,389,340 | $ 1,236,776 | $ (71,476) | $ 152,633 | $ 1,317,933 | $ 71,407 |  |  |  |  |
Balance TNMP at Dec. 31, 2015 | $ 1,654,813 |  |  |  |  |  | $ 1,317,933 |  |  |  |  |  | $ 533,380 | $ 64 | $ 404,166 |  | $ 129,150

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