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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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Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings before subsidiary preferred stock dividends | $ 26,446 |  |  |  |  |  | $ 20,110 |  |  |  |  |  |  |  |  |
Net earnings | 22,862 |  |  |  |  |  | 16,658 |  |  |  |  |  | $ 7,604 |  |  |
Total other comprehensive income | 3,993 |  |  |  |  |  | 4,038 |  |  |  |  |  |  |  |  |
Subsidiary preferred stock dividends | (132) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared on common stock |  |  |  |  |  |  |  |  |  |  |  |  | (9,900) |  |  |
Ending balance at Mar. 31, 2017 | (88,458) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect adjustment (Note 7) | (11,208) |  |  | $ (11,208) | $ 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 | 18,799 | 15,122 |  |  | 15,122 | 3,677 | 11,514 | 7,837 |  |  | 7,837 | 3,677 |  |  |  |
Net earnings | 14,990 |  |  |  |  |  | 7,837 |  |  |  |  |  | 9,413 |  |  | 9,413
Total other comprehensive income | 1,628 | 1,628 |  | 1,628 |  |  | 282 | 282 |  | 282 |  |  |  |  |  |
Subsidiary preferred stock dividends | (132) | (132) |  |  | (132) |  |  |  |  |  |  |  |  |  |  |
Dividends declared on preferred stock |  |  |  |  |  |  | (132) | (132) |  |  | (132) |  |  |  |  |
Dividends declared on common stock | (21,108) | (21,108) |  |  | (21,108) |  |  |  |  |  |  |  | (1,024) |  |  | (1,024)
Proceeds from stock option exercise | 802 | 802 | 802 |  |  |  |  |  |  |  |  |  |  |  |  |
Awards of common stock | (10,845) | (10,845) | (10,845) |  |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation expense | 2,894 | 2,894 | 2,894 |  |  |  |  |  |  |  |  |  |  |  |  |
Valencia’s transactions with its owner | (4,472) |  |  |  |  | (4,472) | (4,472) |  |  |  |  | (4,472) |  |  |  |
Ending balance at Mar. 31, 2018 | 1,749,014 | $ 1,683,614 | $ 1,150,516 | $ (105,520) | $ 638,618 | $ 65,400 | 1,495,561 | $ 1,430,161 | $ 1,264,918 | $ (108,019) | $ 273,262 | $ 65,400 |  |  |  |
Ending balance TNMP at Mar. 31, 2018 | $ 1,683,614 |  |  |  |  |  | $ 1,430,161 |  |  |  |  |  | $ 642,794 | $ 64 | $ 504,166 | $ 138,564

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