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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, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year $ 1,406 $ 1,081 $ 1,209
Charged to costs and expenses 2,835 3,360 2,619
Charged to other accounts 0 0 0
Write-offs and other 3,078 3,035 2,747
Balance at end of year 1,163 1,406 1,081
Public Service Company of New Mexico      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 1,406 1,081 1,209
Charged to costs and expenses 2,790 3,338 2,615
Charged to other accounts 0 0 0
Write-offs and other 3,033 3,013 2,743
Balance at end of year 1,163 1,406 1,081
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 44 22 4
Charged to other accounts 0 0 0
Write-offs and other 44 22 4
Balance at end of year $ 0 $ 0 $ 0