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Certain Financial Statement Information (Details 7) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Mar. 31, 2012
Schedule of other assets    
Non-current portion of prepaid expenses $ 8,754 $ 4,193
Strategic investments 5,250 4,750
Other 0 1,331
Total other assets $ 14,004 $ 10,274