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Lease Commitments Schedule of Rent Expense (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
PNMR [Member] |  |  |
Operating lease expense [Line Items] |  |  |
Operating Leases, Rent Expense, Net | $ 86,323 | $ 79,491 | $ 77,697
Public Service Company of New Mexico [Member] |  |  |
Operating lease expense [Line Items] |  |  |
Operating Leases, Rent Expense, Net | 78,422 | 71,209 | 75,865
Texas-New Mexico Power Company [Member] |  |  |
Operating lease expense [Line Items] |  |  |
Operating Leases, Rent Expense, Net | $ 3,606 | $ 3,737 | $ 2,493

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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