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Capitalization (Tables) | 6 Months Ended
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Jun. 30, 2012
Debt Disclosure [Abstract] |
Schedule of Short-term Debt [Table Text Block] | Short-term debt outstanding consisted of:
|  | June 30, |  | December 31,
Short-term Debt |  | 2012 |  | 2011
|  | (In thousands)
PNM – Revolving credit facility |  | $ | 86,400 |  |  | $ | 66,000 |
TNMP – Revolving credit facility |  | — |  |  | — |
PNMR |  |  |  |
Revolving credit facility |  | 120,600 |  |  | 16,700 |
Bi-lateral line of credit |  | — |  |  | — |
|  | $ | 207,000 |  |  | $ | 82,700 |

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- Definition Tabular disclosure of short-term debt arrangements (having initial terms of repayment within one year or the normal operating cycle, if longer) including: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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