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Significant Accounting Policies and Responsibility for Financial Statements Summarized Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Results of Operations          
Operating revenues $ 433,586 $ 422,666 $ 1,113,458 $ 1,092,857  
Financial Position          
Net property, plant, and equipment 258,285   258,285   $ 194,427
Total assets 7,200,932 6,848,995 7,200,932 6,848,995 6,865,551
Owners’ equity (1,670,913)   (1,670,913)   (1,688,382)
NMRD          
Results of Operations          
Operating revenues 892 1,007 2,720 2,516  
Operating expenses 730 472 2,181 1,478  
Net Earnings Attributable to PNMR 162 $ 535 539 $ 1,038  
Financial Position          
Current assets 2,243   2,243   2,581
Net property, plant, and equipment 111,056   111,056   50,784
Total assets 113,299   113,299   53,365
Current liabilities 1,132   1,132   237
Owners’ equity $ 112,167   $ 112,167   $ 53,128