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Optim Energy (Details) (USD $)	3 Months Ended		9 Months Ended			1 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010	Dec. 31, 2010 Optim Energy [Member]	Sep. 30, 2010 Optim Energy [Member]	Sep. 30, 2011 Optim Energy [Member]	Sep. 30, 2010 Optim Energy [Member]	Sep. 23, 2011 Optim Energy [Member]	Sep. 22, 2011 Optim Energy [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage										1.00%	50.00%
Commitments and Contingencies
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]
Net earnings (loss)							7,600,000		(6,800,000)
PNMR equity in net earnings (loss) of Optim Energy	0	2,495,000	0	(5,714,000)			2,500,000	0	(5,700,000)
Equity Method Investment Summarized Financial Information, Equity [Abstract]
PNMR equity investment in Optim Energy						0
Equity Method Investment, Other than Temporary Impairment						$ 188,200,000

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