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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, 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
U.S [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 13,197 21,347 18,642
Canada [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 1,663 1,219 6,670
Europe [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 14,709 2,868 10,289
China [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 17,906 16,929 219,194
Korea [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 10,945 12,486 10,281
India [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 17,062 14,212 3,835
Australia [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 $ 11,937 $ 7,482 $ 17,692