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Condensed Consolidated Statement of Changes in Equity - 6 months ended Jun. 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 7,347 7,347 7,347                          
Awards of common stock (18,814) (18,814) (18,814)                          
Excess tax (shortfall) from stock-based payment arrangements (136) (136) (136)                          
Stock based compensation expense 2,761 2,761 2,761                          
Valencia’s transactions with its owner (7,614)         (7,614) (7,614)         (7,614)        
Net Earnings 53,508 46,277     46,277 7,231 38,866 31,635   0 31,635 $ 7,231 19,559      
Net earnings 46,013           31,635           19,559     19,559
Subsidiary preferred stock dividends (264) (264)     (264)                      
Total other comprehensive income (2,070) (2,070)   (2,070)     (2,070) (2,070)   (2,070) 0   0      
Dividends declared on common stock (15,931) (15,931)     (15,931)   (20,000) (20,000)   0 (20,000)   (7,694)     (7,694)
Dividends declared on preferred stock             (264) (264)   0 (264)          
Ending balance at Jun. 30, 2015 1,813,879 $ 1,740,716 $ 1,165,003 $ (63,825) $ 639,538 $ 73,163 1,345,320 $ 1,272,157 $ 1,061,776 $ (63,825) $ 274,206 $ 73,163        
Ending balance TNMP at Jun. 30, 2015 $ 1,740,716           $ 1,272,157           $ 536,530 $ 64 $ 404,166 $ 132,300