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Optim Energy (Details) (USD $) | 12 Months Ended | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2010 Optim Energy [Member] | Sep. 30, 2011 Optim Energy [Member] | Dec. 31, 2011 Optim Energy [Member] | Dec. 31, 2010 Optim Energy [Member] | Dec. 31, 2009 Optim Energy [Member] | Sep. 23, 2011 Optim Energy [Member] | Sep. 22, 2011 Optim Energy [Member] | Jan. 04, 2012 Optim Energy [Member] Sale of Ownership Interst [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of equity investment in Optim Energy | $ 0 | $ 188,176,000 | $ 0 | $ 188,200,000 |  |  |  |  |  |  |
Equity method investment other than temporary impairment, net of tax |  |  |  | 113,700,000 |  |  |  |  |  |  |
Equity method investment,ownership percentage |  |  |  |  |  |  |  |  |  | 50.00% |
Cost method investment, ownership percentage |  |  |  |  |  |  |  |  | 1.00% |  |
Ownership percentage, sold |  |  |  |  |  |  |  |  |  |  | 1.00%
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  | 256,786,000 |  | 374,358,000 | 319,507,000 |  |  |
Gross margin |  |  |  |  | 84,689,000 |  | 109,980,000 | 117,960,000 |  |  |
Net earnings (loss) |  |  |  |  | (21,434,000) |  | (25,090,000) | (56,826,000) |  |  |
PNMR equity in net earnings (loss) of Optim Energy | 0 | (15,223,000) | (30,145,000) |  | 0 | 0 | (15,200,000) | (30,100,000) |  |  |
Equity Method Investment, Summarized Financial Information, Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  | 105,413,000 |  |  | 105,413,000 |  |  |  |
Non-current assets |  |  |  | 1,045,248,000 |  |  | 1,045,248,000 |  |  |  |
Equity Method Investment, Summarized Financial Information, Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current liabilities |  |  |  | (50,226,000) |  |  | (50,226,000) |  |  |  |
Long-term debt |  |  |  | (717,000,000) |  |  | (717,000,000) |  |  |  |
Other long-term liabilities |  |  |  | (7,515,000) |  |  | (7,515,000) |  |  |  |
Equity Method Investment Summarized Financial Information, Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |
Owners’ equity |  |  |  | 375,920,000 |  |  | 375,920,000 |  |  |  |
50 percent of owners’ equity |  |  |  | 187,960,000 |  |  | 187,960,000 |  |  |  |
PNMR basis difference in Optim Energy |  |  |  | 216,000 |  |  | 216,000 |  |  |  |
Impairment of equity investment in Optim Energy |  |  |  | (188,176,000) |  |  | (188,176,000) |  |  |  |
PNMR equity investment in Optim Energy |  |  |  | $ 0 |  |  | $ 0 |  |  |  |

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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6382870&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 19 -Subparagraph c -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 6 -Subparagraph 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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 9 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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