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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year $ 1,081 $ 1,209 $ 1,397
Charged to costs and expenses 3,360 2,619 2,885
Charged to other accounts 0 0 0
Write-offs 3,035 2,747 3,073
Balance at end of year 1,406 1,081 1,209
Public Service Company of New Mexico      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 1,081 1,209 1,397
Charged to costs and expenses 3,338 2,615 2,871
Charged to other accounts 0 0 0
Write-offs 3,013 2,743 3,059
Balance at end of year 1,406 1,081 1,209
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 22 4 14
Charged to other accounts 0 0 0
Write-offs 22 4 14
Balance at end of year $ 0 $ 0 $ 0