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Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
Balance at beginning of year | $ 1,778 | $ 11,178 | [1] | $ 12,783 |
Charged to costs and expenses | 3,367 | 24,116 |  | 27,566 |
Charged to other accounts | 0 | 0 |  | 0 |
Write-offs and other | 3,394 | 33,516 | [1] | 29,171 |
Balance at end of year | 1,751 | 1,778 |  | 11,178 | [1]
Public Service Company of New Mexico [Member] |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
Balance at beginning of year | 1,778 | 1,483 |  | 1,483 |
Charged to costs and expenses | 3,384 | 3,736 |  | 2,600 |
Charged to other accounts | 0 | 0 |  | 0 |
Write-offs and other | 3,411 | 3,441 |  | 2,600 |
Balance at end of year | 1,751 | 1,778 |  | 1,483 |
Texas-New Mexico Power Company [Member] |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
Balance at beginning of year | 0 | 0 |  | 0 |
Charged to costs and expenses | (17) | 33 |  | 22 |
Charged to other accounts | 0 | 0 |  | 0 |
Write-offs and other | (17) | 33 |  | 22 |
Balance at end of year | $ 0 | $ 0 |  | $ 0 |
[1] | 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, 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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- Definition Total of the deductions in a given period to 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, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + 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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