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Business Segment And Geographic Information (Geographic Information About Revenue, Based On Shipments To Customers By Region) (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
U.S [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 21,347 18,642 40,750
North America And South America [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 1,219 6,670 4,441
Europe [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 2,868 10,289 14,758
China [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 16,929 219,194 241,462
Korea [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 12,486 10,281 8,245
India [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 14,212 3,835 1,787
Other Asia-Pacific [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 $ 7,482 $ 17,692 $ 4,512