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Business Segment And Geographic Information (Operating Results For Two Business Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Segment Reporting Information [Line Items]
Revenues	$ 28,627	$ 18,058	$ 20,800	$ 9,058	$ 59,751	$ 31,570	$ 98,073	$ 97,209	$ 76,543	$ 286,603	$ 315,955
Operating (loss) income	(20,418)	(26,569)	(51,125)	(38,327)	(184,184)	(22,960)	13,080	16,081	(136,439)	(177,983)	38,661
Wind [Member]
Segment Reporting Information [Line Items]
Revenues									44,642	231,761	251,487
Operating (loss) income									(62,217)	(100,546)	91,000
Grid [Member]
Segment Reporting Information [Line Items]
Revenues									31,901	54,842	64,468
Operating (loss) income									(29,645)	(63,855)	(37,828)
Unallocated Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Operating (loss) income									$ (44,577)	$ (13,582)	$ (14,511)

X

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

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X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 03

-Paragraph 1



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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