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Summary Of Significant Accounting Policies (Reconciliation Of Numerators And Denominators Of EPS Calculation) (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
Summary Of Significant Accounting Policies [Abstract]                      
Net (loss) income $ (21,168) $ (26,271) $ (51,709) $ (37,679) $ (185,135) $ (18,158) $ 7,839 $ 9,170 $ (136,827) $ (186,284) $ 16,248
Weighted-average shares of common stock outstanding                 51,144 47,750 44,493
Weighted-average shares subject to repurchase                 (302) (647) (48)
Shares used in per-share calculation basic                 50,842 47,103 44,445
Dilutive effect of employee equity incentive plans                     845
Shares used in per-share calculation diluted                 50,842 47,103 45,290
Net (loss) income per 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 (loss) income per share diluted $ (0.42) $ (0.52) $ (1.02) $ (0.74) $ (3.67) $ (0.38) $ 0.17 $ 0.20 $ (2.69) $ (3.95) $ 0.36