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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

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