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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
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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)

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