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Quarterly Financial Data (Schedule Of Quarterly Financial Data) (Details) (USD $)
In Thousands, except Per Share data, 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
Quarterly Financial Data [Abstract]                      
Total revenue $ 28,627 $ 18,058 $ 20,800 $ 9,058 $ 59,751 $ 31,570 $ 98,073 $ 97,209 $ 76,543 $ 286,603 $ 315,955
Operating income (loss) (20,418) (26,569) (51,125) (38,327) (184,184) (22,960) 13,080 16,081 (136,439) (177,983) 38,661
Net income (loss) (21,168) (26,271) (51,709) (37,679) (185,135) (18,158) 7,839 9,170 (136,827) (186,284) 16,248
Net income (loss) per common share-basic $ (0.42) $ (0.52) $ (1.02) $ (0.74) $ (3.67) $ (0.38) $ 0.17 $ 0.20 $ (2.69) $ (3.95) $ 0.37
Net income (loss) per common share-diluted $ (0.42) $ (0.52) $ (1.02) $ (0.74) $ (3.67) $ (0.38) $ 0.17 $ 0.20 $ (2.69) $ (3.95) $ 0.36
Patent costs                 $ 4,917