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Condensed Consolidated Statements of Changes in Equity (USD $)
In Thousands, unless otherwise specified
Total
Common Stock [Member]
AOCI [Member]
Retained Earnings [Member]
Parent [Member]
Non-controlling Interest in Valencia [Member]
Pnm Electric [Member]
Pnm Electric [Member]
Common Stock [Member]
Pnm Electric [Member]
AOCI [Member]
Pnm Electric [Member]
Retained Earnings [Member]
Pnm Electric [Member]
Parent [Member]
Pnm Electric [Member]
Non-controlling Interest in Valencia [Member]
Tnmp Electric [Member]
Tnmp Electric [Member]
Common Stock [Member]
Tnmp Electric [Member]
Additional Paid-in Capital [Member]
Tnmp Electric [Member]
AOCI [Member]
Tnmp Electric [Member]
Retained Earnings [Member]
Balance TNMP at Dec. 31, 2013 $ 1,673,569           $ 1,210,199           $ 502,931 $ 64 $ 404,166 $ (263) $ 98,964
Balance at Dec. 31, 2013 1,750,598 1,178,369 (58,140) 553,340 1,673,569 77,029 1,287,228 1,061,776 (57,877) 206,300 1,210,199 77,029          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                  
Proceeds from stock option exercise 5,495 5,495     5,495                        
Awards of common stock (15,573) (15,573)     (15,573)                        
Excess tax (shortfall) from stock-based payment arrangements (95) (95)     (95)                        
Stock based compensation expense 4,680 4,680     4,680                        
Valencia’s transactions with its owner (12,749)         (12,749) (12,749) 0 0 0 0 (12,749)          
Net Earnings 108,798     97,658 97,658 11,140 84,512 0 0 73,372 73,372 11,140 28,691        
Net earnings 97,262           73,372           28,691       28,691
Subsidiary preferred stock dividends (396)     (396) (396)                        
Total other comprehensive income 1,608   1,608   1,608   1,599 0 1,599 0 1,599 0 9     9  
Dividends declared on preferred stock (396)           (396) 0 0 (396) (396) 0 0        
Dividends declared on common stock (44,208)     (44,208) (44,208)   (30,263) 0 0 (30,263) (30,263) 0 (16,336)       (16,336)
Balance TNMP at Sep. 30, 2014 1,722,738           1,254,511           515,295 64 404,166 (254) 111,319
Balance at Sep. 30, 2014 1,798,158 1,172,876 (56,532) 606,394 1,722,738 75,420 1,329,931 1,061,776 (56,278) 249,013 1,254,511 75,420          
Balance TNMP at Jun. 30, 2014                                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                  
Net Earnings 59,486           49,052           12,355        
Net earnings 55,653           45,351           12,355        
Subsidiary preferred stock dividends (132)                                
Total other comprehensive income (644)           (638)           (6)        
Dividends declared on preferred stock (132)           (132)           0        
Balance TNMP at Sep. 30, 2014 1,722,738           1,254,511           515,295 64 404,166    
Balance at Sep. 30, 2014 $ 1,798,158           $ 1,329,931