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Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 0 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 Public Service Company of New Mexico [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] | Dec. 31, 2009 Public Service Company of New Mexico [Member] | Dec. 31, 2011 Texas-New Mexico Power Company [Member] | Dec. 31, 2010 Texas-New Mexico Power Company [Member] | Dec. 31, 2009 Texas-New Mexico Power Company [Member] | Nov. 01, 2011 First Choice [Member]
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year | $ 11,178 |  | $ 12,783 | [1] | $ 21,466 | [1] | $ 1,483 | $ 1,483 | [1] | $ 1,345 | [1] | $ 0 | $ 0 | $ 0 |
Charged to costs and expenses | 24,116 |  | 27,566 |  | 43,937 | [1] | 3,736 | 2,600 |  | 2,534 | [1] | 33 | 22 | 238 |
Charged to other accounts | 0 |  | 0 |  | 0 | [1] | 0 | 0 |  | 0 | [1] | 0 | 0 | 0 |
Write-offs and other | 33,516 | [2] | 29,171 |  | 52,620 | [1] | 3,441 | 2,600 |  | 2,396 | [1] | 33 | 22 | 238 |
Balance at end of year | 1,778 |  | 11,178 |  | 12,783 | [1] | 1,778 | 1,483 |  | 1,483 | [1] | 0 | 0 | 0 |
Valuation Allowances and Reserves, reduction due to sale of business divestiture |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,818
[1] | Totals reflect continuing operations.
[2] | Includes reduction of $11,818 due to the sale of First Choice on November 1, 2011.

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to accounts other than costs and expenses in a given period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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