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Schedule II - Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year $ 1,751 $ 1,778 [1] $ 11,178
Charged to costs and expenses 2,849 3,367 24,116
Charged to other accounts 0 0 0
Write-offs and other 3,177 3,394 [1] 33,516
Balance at end of year 1,423 1,751 1,778 [1]
Public Service Company of New Mexico [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 1,751 1,778 1,483
Charged to costs and expenses 2,864 3,384 3,736
Charged to other accounts 0 0 0
Write-offs and other 3,192 3,411 3,441
Balance at end of year 1,423 1,751 1,778
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 (15) (17) 33
Charged to other accounts 0 0 0
Write-offs and other (15) (17) 33
Balance at end of year 0 0 0
First Choice [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Write-offs and other     $ 11,818
[1] Includes reduction of $11,818 due to the sale of First Choice on November 1, 2011.