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Condensed Consolidated Statement of Changes in Equity - USD ($) $ in Thousands | Total | Total PNMR Common Stockholders’ Equity | Common Stock | AOCI | Retained Earnings | Non- controlling Interest in Valencia | PNM | PNM Total PNMR Common Stockholders’ Equity | PNM Common Stock | PNM AOCI | PNM Retained Earnings | PNM Non- controlling Interest in Valencia | Texas-New Mexico Power Company | Texas-New Mexico Power Company Common Stock | Texas-New Mexico Power Company Paid-in Capital | Texas-New Mexico Power Company Retained Earnings
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Beginning balance at Dec. 31, 2016 |  |  |  | $ (92,451) |  |  |  |  |  | $ (92,428) |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings before subsidiary preferred stock dividends | $ 67,677 |  |  |  |  |  | $ 50,587 |  |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  |  | 43,591 |  |  |  |  |  | $ 19,808 |  |  |
Total other comprehensive income | 6,856 |  |  |  |  |  | 6,834 |  |  |  |  |  |  |  |  |
Subsidiary preferred stock dividends | (264) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared on common stock |  |  |  |  |  |  |  |  |  |  |  |  | (17,500) |  |  |
Ending balance at Jun. 30, 2017 | (85,595) |  |  |  |  |  |  |  |  | (85,594) |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect adjustment (Note 7) |  |  |  | (11,208) | $ 11,208 |  |  |  |  | (11,208) | $ 11,208 |  |  |  |  |
Balance, as adjusted | 1,761,448 | $ 1,695,253 | $ 1,157,665 | (107,148) | 644,736 | $ 66,195 | 1,488,369 | $ 1,422,174 | $ 1,264,918 | (108,301) | 265,557 | $ 66,195 |  |  |  |
Beginning balance at Dec. 31, 2017 | 1,761,448 | 1,695,253 | 1,157,665 | (95,940) | 633,528 | 66,195 | 1,488,369 | 1,422,174 | 1,264,918 | (97,093) | 254,349 | 66,195 |  |  |  |
Beginning balance TNMP at Dec. 31, 2017 | 1,695,253 |  |  |  |  |  | 1,422,174 |  |  |  |  |  | 634,405 | $ 64 | $ 504,166 | $ 130,175
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings before subsidiary preferred stock dividends | 61,248 | 53,462 |  |  | 53,462 | 7,786 | 42,296 | 34,510 |  |  | 34,510 | 7,786 |  |  |  |
Net earnings |  |  |  |  |  |  | 34,510 |  |  |  |  |  | 24,779 |  |  | 24,779
Total other comprehensive income | 3,391 | 3,391 |  | 3,391 |  |  | 1,592 | 1,592 |  | 1,592 |  |  |  |  |  |
Subsidiary preferred stock dividends | (264) | (264) |  |  | (264) |  |  |  |  |  |  |  |  |  |  |
Dividends declared on preferred stock |  |  |  |  |  |  | (264) | (264) |  |  | (264) |  |  |  |  |
Dividends declared on common stock | (21,108) | (21,108) |  |  | (21,108) |  |  |  |  |  |  |  | (10,436) |  |  | (10,436)
Proceeds from stock option exercise | 924 | 924 | 924 |  |  |  |  |  |  |  |  |  |  |  |  |
Awards of common stock | (12,268) | (12,268) | (12,268) |  |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation expense | 3,325 | 3,325 | 3,325 |  |  |  |  |  |  |  |  |  |  |  |  |
Valencia’s transactions with its owner | (8,381) |  |  |  |  | (8,381) | (8,381) |  |  |  |  | (8,381) |  |  |  |
Ending balance at Jun. 30, 2018 | 1,788,315 | $ 1,722,715 | $ 1,149,646 | $ (103,757) | $ 676,826 | $ 65,600 | 1,523,612 | $ 1,458,012 | $ 1,264,918 | $ (106,709) | $ 299,803 | $ 65,600 |  |  |  |
Ending balance TNMP at Jun. 30, 2018 | $ 1,722,715 |  |  |  |  |  | $ 1,458,012 |  |  |  |  |  | $ 648,748 | $ 64 | $ 504,166 | $ 144,518

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