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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
Beginning balance at Dec. 31, 2016       $ (92,451)           $ (92,428)            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                
Net earnings before subsidiary preferred stock dividends $ 146,004           $ 115,869                  
Net earnings             104,417           $ 34,535      
Total other comprehensive income 9,950           9,823                  
Subsidiary preferred stock dividends (396)                              
Dividends declared on common stock                         (29,700)      
Ending balance at Sep. 30, 2017       (82,501)           (82,605)            
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 152,821 141,115     141,115 11,706 123,724 112,018     112,018 11,706        
Net earnings             112,018           40,879     40,879
Total other comprehensive income 5,668 5,668   5,668     3,780 3,780   3,780            
Subsidiary preferred stock dividends (396) (396)     (396)                      
Dividends declared on preferred stock             (396) (396)     (396)          
Dividends declared on common stock (63,325) (63,325)     (63,325)               (25,804)     (25,804)
Proceeds from stock option exercise 937 937 937                          
Awards of common stock (12,505) (12,505) (12,505)                          
Stock based compensation expense 4,551 4,551 4,551                          
Valencia’s transactions with its owner (12,677)         (12,677) (12,677)         (12,677)        
Ending balance at Sep. 30, 2018 1,836,522 $ 1,771,298 $ 1,150,648 $ (101,480) $ 722,130 $ 65,224 1,602,800 $ 1,537,576 $ 1,264,918 $ (104,521) $ 377,179 $ 65,224        
Ending balance TNMP at Sep. 30, 2018 $ 1,771,298           $ 1,537,576           $ 649,480 $ 64 $ 504,166 $ 145,250