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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $)
 3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Consolidated Statements of Comprehensive Income (Loss) (Unaudited) [Abstract]    
Net income (loss) $ 100,980,000 $ (9,862,000)
Other Comprehensive income (loss), net of tax:    
Unrealized gain (loss) on short-term investments 0 (7,000)
Foreign currency translation 12,000 (547,000)
Total other comprehensive income (loss), net of tax 12,000 (554,000)
Comprehensive income (loss) $ 100,992,000 $ (10,416,000)