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Condensed Consolidated Statement of Changes in Equity - 6 months ended Jun. 30, 2016 - USD ($)
$ in Thousands
Total
Total PNMR Common Stockholders’ Equity [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]
Total PNMR Common Stockholders’ Equity [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]
Paid-in Capital [Member]
Texas-New Mexico Power Company [Member]
Retained Earnings [Member]
Beginning balance at Dec. 31, 2015 $ 1,726,220 $ 1,654,813 $ 1,166,465 $ (71,432) $ 559,780 $ 71,407 $ 1,389,340 $ 1,317,933 $ 1,236,776 $ (71,476) $ 152,633 $ 71,407        
Beginning balance TNMP at Dec. 31, 2015 1,654,813           1,317,933           $ 533,380 $ 64 $ 404,166 $ 129,150
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                
Net Earnings 44,917 37,886     37,886 7,031 27,352 20,321 0 20,321 7,031        
Total other comprehensive income (loss) (3,274) (3,274)   (3,274)     (2,435) (2,435) (2,435) 0          
Subsidiary preferred stock dividends (264) (264)     (264)                      
Dividends declared on preferred stock             (264) (264)   0 (264)        
Equity contribution from parent             4,142 4,142 4,142              
Dividends declared on common stock (17,524) (17,524)     (17,524)   (4,142) (4,142)   0 (4,142)   (7,456)     (7,456)
Awards of common stock (14,367) (14,367) (14,367)                          
Proceeds from stock option exercise 6,569 6,569 6,569                          
Excess tax (shortfall) from stock-based payment arrangements (15) (15) (15)                          
Stock based compensation expense 3,543 3,543 3,543                          
Valencia’s transactions with its owner (7,394)         (7,394) (7,394)         (7,394)        
Net earnings 37,622           20,321           17,965     17,965
Ending balance at Jun. 30, 2016 1,738,411 $ 1,667,367 $ 1,162,195 $ (74,706) $ 579,878 $ 71,044 1,406,599 $ 1,335,555 $ 1,240,918 $ (73,911) $ 168,548 $ 71,044        
Ending balance TNMP at Jun. 30, 2016 $ 1,667,367           $ 1,335,555           $ 543,889 $ 64 $ 404,166 $ 139,659