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Condensed Consolidated Statement of Changes in Equity - USD ($)
$ in Thousands
Total
Total PNMR Common 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 PNMR Common 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                
Cumulative effect adjustment (Note 8) $ 10,382 $ 10,382 $ 0 $ 0 $ 10,382 $ 0                    
Balance, as adjusted 1,755,254 1,686,334 1,163,661 (92,451) 615,124 68,920                    
Beginning 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        
Beginning balance TNMP at Dec. 31, 2016 1,675,952           1,397,872           $ 593,235 $ 64 $ 454,166 $ 139,005
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                
Net Earnings 26,446 22,994     22,994 3,452 20,110 16,658 0 16,658 3,452        
Net earnings 22,862           16,658           7,604     7,604
Total other comprehensive income 3,993 3,993   3,993     4,038 4,038 4,038 0          
Subsidiary preferred stock dividends (132) (132)     (132)                      
Dividends declared on preferred stock             (132) (132)   0 (132)        
Dividends declared on common stock (19,316) (19,316)     (19,316)               (9,855)     (9,855)
Proceeds from stock option exercise 1,112 1,112 1,112                          
Awards of common stock (11,032) (11,032) (11,032)                          
Stock based compensation expense 2,687 2,687 2,687                          
Valencia’s transactions with its owner (4,028)         (4,028) (4,028)         (4,028)        
Ending balance at Mar. 31, 2017 1,754,984 $ 1,686,640 $ 1,156,428 $ (88,458) $ 618,670 $ 68,344 1,486,780 $ 1,418,436 $ 1,264,918 $ (88,390) $ 241,908 $ 68,344        
Ending balance TNMP at Mar. 31, 2017 $ 1,686,640           $ 1,418,436           $ 590,984 $ 64 $ 454,166 $ 136,754