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Lease Commitments Schedule of Rent Expense (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
PNMR [Member]
      
Operating lease expense [Line Items]      
Operating Leases, Rent Expense, Net $ 84,794 $ 86,323 $ 79,491
Public Service Company of New Mexico [Member]
      
Operating lease expense [Line Items]      
Operating Leases, Rent Expense, Net 78,483 78,422 71,209
Texas-New Mexico Power Company [Member]
      
Operating lease expense [Line Items]      
Operating Leases, Rent Expense, Net $ 2,871 $ 3,606 $ 3,737