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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, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Segment Reporting Information [Line Items]
Revenues	$ 20,419	$ 17,417	$ 20,867	$ 28,716	$ 28,627	$ 18,058	$ 20,800	$ 9,058	$ 87,419	$ 76,543	$ 286,603
Operating loss	(16,027)	(20,616)	(14,970)	(6,128)	(20,418)	(26,569)	(51,125)	(38,327)	(57,741)	(136,439)	(177,983)
Wind [Member]
Segment Reporting Information [Line Items]
Revenues									44,231	44,642	231,761
Operating loss									(16,098)	(62,217)	(100,546)
Grid [Member]
Segment Reporting Information [Line Items]
Revenues									43,188	31,901	54,842
Operating loss									(23,815)	(29,645)	(63,855)
Unallocated Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Operating loss									$ (17,828)	$ (44,577)	$ (13,582)

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 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



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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