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Equity Method Investment - Summarized Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]                      
Operating Revenues $ 359,276 $ 472,465 $ 357,649 $ 333,622 $ 344,144 $ 433,586 $ 330,228 $ 349,645 $ 1,523,012 $ 1,457,603 $ 1,436,613
Net earnings 8,778 $ 121,768 $ 57,489 $ (15,260) 31,805 $ 102,771 $ (75,914) $ 18,700      
Balance Sheet Related Disclosures [Abstract]                      
Net property, plant, and equipment 218,719       161,106       218,719 161,106  
Total assets 7,939,854       7,298,774       7,939,854 7,298,774 6,865,551
Total PNMR common stockholders’ equity 2,049,465       1,678,698       2,049,465 1,678,698  
NMRD                      
Income Statement [Abstract]                      
Operating Revenues                 10,366 3,662 3,147
Operating expenses                 7,476 2,971 2,136
Net earnings                 2,890 691 $ 1,011
Balance Sheet Related Disclosures [Abstract]                      
Current assets 8,046       7,187       8,046 7,187  
Net property, plant, and equipment 172,585       132,772       172,585 132,772  
Non-current assets 1,900       0       1,900 0  
Total assets 182,531       139,959       182,531 139,959  
Current liabilities 841       9,640       841 9,640  
Non-current liabilities 380       0       380 0  
Total PNMR common stockholders’ equity $ 181,310       $ 130,319       $ 181,310 $ 130,319