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Goodwill Impairment (Details) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2014 DPLER [Member]	Mar. 31, 2014 Buffalo Gap [Member] MW project	Sep. 30, 2013 Ebute [Member] MW
Goodwill [Line Items]
Goodwill					$ 136,000,000
Goodwill implied fair value					0
Goodwill impairment expense	$ 0	$ 58,000,000	$ 154,000,000	$ 58,000,000	$ 136,000,000	$ 18,000,000	$ 58,000,000
Number of wind projects						3
Generation capacity mega watts						524	294

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Goodwill Impairment Test, Number of Wind Projects

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Fair value portion of asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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