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Consolidated Statements of Changes in Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
AOCI [Member]
Retained Earnings [Member]
Total 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 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]
AOCI [Member]
Texas-New Mexico Power Company [Member]
Paid-in Capital [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          
Beginning Balance at Dec. 31, 2013     (58,140)           (57,877)       $ 502,931 $ 64 $ (263) $ 404,166 $ 98,964
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                  
Net earnings (loss) 130,909     116,782 116,782 14,127 101,453     87,326 87,326 14,127          
Net Earnings 116,254           87,326           37,807       37,807
Total other comprehensive income (loss) (3,615)   (3,615)   (3,615)   (3,878)   (3,878)   (3,878)   263   $ 263    
Subsidiary preferred stock dividends/dividends declared on preferred stock (528)     (528) (528)   (528)     (528) (528)            
Dividends declared on common stock (60,138)     (60,138) (60,138)   (30,263)     (30,263) (30,263)   (16,336)       (16,336)
Proceeds from stock option exercise 6,999 6,999     6,999                        
Awards of common stock (17,319) (17,319) 0 0 (17,319) 0                      
Excess tax (shortfall) from stock-based payment arrangements (135) (135)     (135)                        
Stock based compensation expense 5,931 5,931     5,931                        
Valencia’s transactions with its owner (17,610)         (17,610) (17,610)                    
Balance at Dec. 31, 2014 1,795,092 1,173,845 (61,755) 609,456 1,721,546 73,546 1,336,402 1,061,776 (61,755) 262,835 1,262,856 73,546          
Ending Balance at Dec. 31, 2014     (61,755)           (61,755)       524,665 64   404,166 120,435
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                  
Net earnings (loss) 31,078     16,168 16,168 14,910 (324)     (15,234) (15,234) 14,910          
Net Earnings 15,640           (15,234)           41,963       41,963
Total other comprehensive income (loss) (9,677)   (9,677)   (9,677)   (9,721)   (9,721)   (9,721)   0        
Subsidiary preferred stock dividends/dividends declared on preferred stock (528)     (528) (528)   (528)     (528) (528)            
Dividends declared on common stock (65,316)     (65,316) (65,316)   (94,440)     (94,440) (94,440)   (33,248)       (33,248)
Proceeds from stock option exercise 5,619 5,619     5,619                        
Awards of common stock (17,720) (17,720) 0 0 (17,720) 0                      
Excess tax (shortfall) from stock-based payment arrangements (142) (142)     (142)                        
Stock based compensation expense 4,863 4,863     4,863                        
Valencia’s transactions with its owner (17,049)         (17,049) (17,049)                    
Equity contributions from parent             175,000 175,000     175,000            
Balance at Dec. 31, 2015 1,726,220 1,166,465 (71,432) 559,780 1,654,813 71,407 1,389,340 1,236,776 (71,476) 152,633 1,317,933 71,407          
Ending Balance at Dec. 31, 2015 1,654,813   (71,432)       1,317,933   (71,476)       533,380 64   404,166 129,150
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                  
Net earnings (loss) 131,896     117,377 117,377 14,519 91,938     77,419 77,419 14,519          
Net Earnings 116,849           77,419           41,672       41,672
Total other comprehensive income (loss) (21,019)   (21,019) 0 (21,019)   (20,952)   (20,952)   (20,952)   0        
Subsidiary preferred stock dividends/dividends declared on preferred stock (528)     (528) (528)   (528)     (528) (528)            
Dividends declared on common stock (71,887)     (71,887) (71,887)   (4,142)     (4,142) (4,142)   (31,817)       (31,817)
Proceeds from stock option exercise 7,028 7,028     7,028                        
Awards of common stock (15,451) (15,451) 0 0 (15,451) 0                      
Excess tax (shortfall) from stock-based payment arrangements (15) (15)     (15)                        
Stock based compensation expense 5,634 5,634     5,634                        
Valencia’s transactions with its owner (17,006)         (17,006) (17,006)                    
Equity contributions from parent             28,142 28,142     28,142   50,000     50,000  
Balance at Dec. 31, 2016 1,744,872 $ 1,163,661 (92,451) $ 604,742 $ 1,675,952 $ 68,920 1,466,792 $ 1,264,918 (92,428) $ 225,382 $ 1,397,872 $ 68,920          
Ending Balance at Dec. 31, 2016 $ 1,675,952   $ (92,451)       $ 1,397,872   $ (92,428)       $ 593,235 $ 64   $ 454,166 $ 139,005