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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year $ 1,397 $ 1,466 $ 1,423
Charged to costs and expenses 2,885 3,358 3,267
Charged to other accounts 0 0 0
Write-offs 3,073 3,427 3,224
Balance at end of year 1,209 1,397 1,466
Public Service Company of New Mexico [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 1,397 1,466 1,423
Charged to costs and expenses 2,871 3,344 3,275
Charged to other accounts 0 0 0
Write-offs 3,059 3,413 3,232
Balance at end of year 1,209 1,397 1,466
Texas-New Mexico Power Company [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 0 0 0
Charged to costs and expenses 14 14 (8)
Charged to other accounts 0 0 0
Write-offs 14 14 (8)
Balance at end of year $ 0 $ 0 $ 0