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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]
Total Company Common Stockholders' Equity [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]
Total Company Common Stockholders' Equity [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 3,258 3,258 0 0 3,258 0                      
Awards of common stock (11,639) (11,639) 0 0 (11,639) 0                      
Excess tax (shortfall) from stock-based payment arrangements (21) (21) 0 0 (21) 0                      
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition 2,131 2,131 0 0 2,131 0                      
Valencia’s transactions with its owner (4,369) 0 0 0 0 (4,369) (4,369) 0 0 0 0 (4,369)          
Net earnings 12,468           7,674           6,803 0 0 0 6,803
Net earnings before subsidiary preferred stock dividends 16,131 0 0 12,600 12,600 3,531 11,205 0 0 7,674 7,674 3,531          
Subsidiary preferred stock dividends (132) 0 0 (132) (132) 0                      
Total other comprehensive income (loss) 791 0 791 0 791 0 855 0 855 0 855 0 (64) 0 0 (64) 0
Dividends declared on preferred stock             (132) 0 0 (132) (132) 0          
Dividends declared on common stock (14,736) 0 0 (14,736) (14,736) 0                      
Balance TNMP at Mar. 31, 2014 1,665,821           1,218,596           509,670 64 404,166 (327) 105,767
Balance at Mar. 31, 2014 $ 1,742,012 $ 1,172,098 $ (57,349) $ 551,072 $ 1,665,821 $ 76,191 $ 1,294,787 $ 1,061,776 $ (57,022) $ 213,842 $ 1,218,596 $ 76,191