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Optim Energy (Tables) | 12 Months Ended
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Dec. 31, 2012
Equity Method Investments and Joint Ventures [Abstract] |
Schedule of Equity Method Investments [Table Text Block] | Summarized results of operations information for Optim Energy is presented below:
Results of Operations
| Nine Months Ended September 30, 2011 |  | Year Ended December 31, 2010
| (In thousands)
Operating revenues | $ | 256,786 |  |  | $ | 374,358 |
Margin | 84,689 |  |  | 109,980 |
Net earnings (loss) | (21,434 | ) |  | (25,090 | )
PNMR recognized net earnings (loss) from Optim Energy of zero and $(15.2) million for the years ended December 31, 2011 and 2010. The 2010 amount includes amortization of a basis difference between PNMR's recorded investment in Optim Energy and 50 percent of Optim Energy's equity.

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- Definition Tabular disclosure of equity method investments in common stock. The disclosure may include: (a) the name of each investee or group of investments for which combined disclosure is appropriate, (2) the percentage ownership of common stock, (3) the difference, if any, between the carrying amount of an investment and the value of the underlying equity in the net assets and the accounting treatment of difference, if any, and (4) the aggregate value of each identified investment based on its quoted market price, if available. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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