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Consolidated Statements of Changes in Equity - USD ($)
$ in Thousands
Total
Total Stockholders' Equity
Common Stock
AOCI
Retained Earnings
Non- controlling Interest in Valencia
Public Service Company of New Mexico
Public Service Company of New Mexico
Total Stockholders' Equity
Public Service Company of New Mexico
Common Stock
Public Service Company of New Mexico
AOCI
Public Service Company of New Mexico
Retained Earnings
Public Service Company of New Mexico
Non- controlling Interest in Valencia
Texas-New Mexico Power Company
Texas-New Mexico Power Company
Common Stock
Texas-New Mexico Power Company
Paid-in Capital
Texas-New Mexico Power Company
Retained Earnings
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 at Dec. 31, 2014       (61,755)           (61,755)     $ 524,665 $ 64 $ 404,166 $ 120,435
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                
Net earnings 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)            
Equity contribution from parent             175,000           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) (17,720) 0 0 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 0 0          
Balance at Dec. 31, 2015 1,726,220 1,654,813 1,166,465 (71,432) 559,780 71,407 1,389,340 1,317,933 1,236,776 (71,476) 152,633 71,407        
Ending Balance at Dec. 31, 2015       (71,432)           (71,476)     533,380 64 404,166 129,150
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                
Net earnings 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)   (21,019)     (20,952) (20,952)   (20,952)            
Equity contribution from parent             28,142           50,000   50,000  
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) (15,451) 0 0 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              
Balance at Dec. 31, 2016 1,744,872 1,675,952 1,163,661 (92,451) 604,742 68,920 1,466,792 1,397,872 1,264,918 (92,428) 225,382 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                
Cumulative effect adjustment (Note 13) | Accounting Standards Update 2016-09 10,382 10,382     10,382                      
Balance at January 1, 2017, as adjusted 1,755,254 1,686,334 1,163,661 (92,451) 615,124 68,920                    
Reclassification of stranded income taxes resulting from tax reform (Note 11) (17,586)     (17,586) 17,586   (17,794)     (17,794) 17,794          
Net earnings 95,419 80,402     80,402 15,017 87,413 72,396     72,396 15,017        
Net Earnings 79,874           72,396           35,559     35,559
Total other comprehensive income (loss) 14,097 14,097   14,097 0   13,129 13,129   13,129            
Equity contribution from parent             0           50,000   50,000  
Subsidiary preferred stock dividends/dividends declared on preferred stock (528) (528)     (528)   (528) (528)     (528)          
Dividends declared on common stock (79,056) (79,056)     (79,056)   (60,695) (60,695)     (60,695)   (44,389)     (44,389)
Proceeds from stock option exercise 1,739 1,739 1,739                          
Awards of common stock (13,929) (13,929) (13,929) 0 0 0                    
Stock based compensation expense 6,194 6,194 6,194                          
Valencia’s transactions with its owner (17,742)         (17,742) (17,742)                  
Balance at Dec. 31, 2017 1,761,448 $ 1,695,253 $ 1,157,665 (95,940) $ 633,528 $ 66,195 1,488,369 $ 1,422,174 $ 1,264,918 (97,093) $ 254,349 $ 66,195        
Ending Balance at Dec. 31, 2017 $ 1,695,253     $ (95,940)     $ 1,422,174     $ (97,093)     $ 634,405 $ 64 $ 504,166 $ 130,175