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Schedule II - Valuation and Qualifying Accounts (Details) - SEC Schedule, 12-09, Reserve, Allowance For Doubtful Accounts - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year $ 1,163 $ 1,406 $ 1,081
Charged to costs and expenses 3,527 2,835 3,360
Charged to other accounts 6,070 0 0
Write-offs and other 2,427 3,078 3,035
Balance at end of year 8,333 1,163 1,406
Public Service Company of New Mexico      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 1,163 1,406 1,081
Charged to costs and expenses 3,482 2,790 3,338
Charged to other accounts 6,070 0 0
Write-offs and other 2,382 3,033 3,013
Balance at end of year 8,333 1,163 1,406
Texas-New Mexico Power Company      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 0 0 0
Charged to costs and expenses 45 44 22
Charged to other accounts 0 0 0
Write-offs and other 45 44 22
Balance at end of year $ 0 $ 0 $ 0