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Condensed Consolidated Statement of Changes in Equity - 9 months ended Sep. 30, 2015 - USD ($)
$ in Thousands
Total
Parent [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]
Parent [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]
Additional Paid-in Capital [Member]
Texas-New Mexico Power Company [Member]
Retained Earnings [Member]
Beginning balance at Dec. 31, 2014 $ 1,795,092 $ 1,721,546 $ 1,173,845 $ (61,755) $ 609,456 $ 73,546 $ 1,336,402 $ 1,262,856 $ 1,061,776 $ (61,755) $ 262,835 $ 73,546        
Beginning 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 7,394 7,394 7,394                          
Awards of common stock (18,955) (18,955) (18,955)                          
Excess tax (shortfall) from stock-based payment arrangements (137) (137) (137)                          
Stock based compensation expense 3,748 3,748 3,748                          
Valencia’s transactions with its owner (12,107)         (12,107) (12,107)         (12,107)        
Net Earnings 118,363 107,454     107,454 10,909 91,923 81,014   0 81,014 $ 10,909 33,248      
Net earnings 107,058           81,014           33,248     33,248
Subsidiary preferred stock dividends (396) (396)     (396)                      
Total other comprehensive income (9,545) (9,545)   (9,545)     (9,117) (9,117) (9,117) 0   0      
Dividends declared on common stock (47,792) (47,792)     (47,792)   (46,152) (46,152)   0 (46,152)   (19,559)     (19,559)
Dividends declared on preferred stock             (396) (396)   0 (396)        
Ending balance at Sep. 30, 2015 1,835,665 $ 1,763,317 $ 1,165,895 $ (71,300) $ 668,722 $ 72,348 1,360,553 $ 1,288,205 $ 1,061,776 $ (70,872) $ 297,301 $ 72,348        
Ending balance TNMP at Sep. 30, 2015 $ 1,763,317           $ 1,288,205           $ 538,354 $ 64 $ 404,166 $ 134,124