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Balance Sheet Accounts (Schedule of Cash and Available-For-Sale Securities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Jun. 30, 2012
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Cash | $ 30,656 | $ 18,455
Cash equivalents | 59,110 | 36,141
Short-term investments | 35,204 | 23,358
Marketable securities | 71,208 | 75,561
Total available-for-sale | 165,522 | 135,060
Total cash and available for sale securities | $ 196,178 | $ 153,515

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