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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]
Public Service Company of New Mexico [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]
Parent [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]
AOCI [Member]
Texas-New Mexico Power Company [Member]
Retained Earnings [Member]
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          
Balance TNMP at Dec. 31, 2013 1,673,569           1,210,199           502,931 64 404,166 (263) 98,964
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                  
Proceeds from stock option exercise 4,446 4,446       4,446                         
Awards of common stock (13,939) (13,939)       (13,939)                         
Excess tax (shortfall) from stock-based payment arrangements (66) (66)       (66)                         
Stock based compensation expense 3,399 3,399       3,399                         
Valencia’s transactions with its owner (8,189)             (8,189) (8,189) 0 0 0 0 (8,189)          
Net earnings 41,609           28,021           16,336          16,336
Net earnings before subsidiary preferred stock dividends 49,312       41,873 41,873 7,439 35,460 0 0 28,021 28,021 7,439          
Subsidiary preferred stock dividends (264)       (264) (264)                         
Total other comprehensive income 2,252    2,252    2,252    2,237 0 2,237 0 2,237 0 15       15   
Dividends declared on preferred stock             (264) 0 0 (264) (264) 0          
Dividends declared on common stock (14,736)       (14,736) (14,736)                (6,803)          (6,803)
Balance TNMP at Jun. 30, 2014 1,696,534           1,240,193           512,479 64 404,166 (248) 108,497
Balance at Jun. 30, 2014 1,772,813 1,172,209 (55,888) 580,213 1,696,534 76,279 1,316,472 1,061,776 (55,640) 234,057 1,240,193 76,279          
Balance at Mar. 31, 2014                                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                  
Net earnings 29,141           20,346           9,534        
Net earnings before subsidiary preferred stock dividends 33,181           24,254                    
Subsidiary preferred stock dividends (132)                                
Total other comprehensive income 1,461           1,382           79        
Balance TNMP at Jun. 30, 2014 1,696,534           1,240,193           512,479        
Balance at Jun. 30, 2014 $ 1,772,813           $ 1,316,472