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Optim Energy (Details) (USD $) | 12 Months Ended | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2010 Optim Energy [Member] | Sep. 30, 2012 Optim Energy [Member] | Dec. 31, 2012 Optim Energy [Member] | Dec. 31, 2011 Optim Energy [Member] | Sep. 23, 2011 Optim Energy [Member] | Sep. 22, 2011 Optim Energy [Member] | Jan. 04, 2012 Optim Energy [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment,ownership percentage |  |  |  |  |  |  |  |  | 50.00% |
PNMR equity investment in Optim Energy |  |  |  |  |  |  | $ 0 |  |  |
Impairment of equity investment in Optim Energy | 0 | 0 | 188,176,000 | 188,200,000 |  |  |  |  |  |
Equity method investment other than temporary impairment, net of tax |  |  |  | 113,700,000 |  |  |  |  |  |
Cost method investment, ownership percentage |  |  |  |  |  |  |  | 1.00% |  |
Ownership percentage, sold |  |  |  |  |  |  |  |  |  | 1.00%
Cost Method Investments |  |  |  |  |  |  |  |  |  | 0
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  | 256,786,000 |  | 374,358,000 |  |  |
Gross margin |  |  |  |  | 84,689,000 |  | 109,980,000 |  |  |
Net earnings (loss) |  |  |  |  | (21,434,000) |  | (25,090,000) |  |  |
PNMR equity in net earnings (loss) of Optim Energy | $ 0 | $ 0 | $ (15,223,000) |  |  | $ 0 | $ (15,200,000) |  |  |

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