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Income Taxes - Federal Income Tax Reform (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Jan. 10, 2018
Aug. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Line Items]          
Net increase in regulatory liabilities       $ 7,175 $ 548,952
Net decrease in deferred income tax liabilities (deferred income tax assets)       1,910 491,491
Net increase in affiliate receivables (affiliate payables)       0  
Net deferred income tax expense       5,265 57,461
Reclassification of stranded income taxes to retained earnings         17,600
Income taxes (benefit)     $ (25,282) 7,775 130,340
Public Service Company of New Mexico          
Income Taxes [Line Items]          
Net increase in regulatory liabilities       11,244 402,501
Net decrease in deferred income tax liabilities (deferred income tax assets)       (2,175) 372,895
Net increase in affiliate receivables (affiliate payables)       12,300  
Net deferred income tax expense       1,119 29,606
Income taxes (benefit)     (25,962) (5,971) 81,555
TNMP          
Income Taxes [Line Items]          
Net increase in regulatory liabilities       (4,069) 146,451
Net decrease in deferred income tax liabilities (deferred income tax assets)       (9,784) 138,586
Net increase in affiliate receivables (affiliate payables)       4,042  
Net deferred income tax expense       1,673 7,865
Income taxes (benefit)     5,046 16,880 31,512
Corporate and Other          
Income Taxes [Line Items]          
Net increase in regulatory liabilities       0 0
Net decrease in deferred income tax liabilities (deferred income tax assets)       13,869 (19,990)
Net increase in affiliate receivables (affiliate payables)       (16,342)  
Net deferred income tax expense       2,473 19,990
Income taxes (benefit)     (4,366) $ (3,134) $ 17,273
NMPRC          
Income Taxes [Line Items]          
Proposed term for providing benefits to customers related to reduction in state corporate tax       23 years  
NMPRC | Public Service Company of New Mexico          
Income Taxes [Line Items]          
Proposed term for providing benefits to customers related to reduction in state corporate tax 3 years 3 years      
New Mexico 2015 Rate Case | Public Service Company of New Mexico          
Income Taxes [Line Items]          
Pre-tax impairment of investments     150,600    
Income taxes (benefit)     $ 45,700