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Fair Value Measurements (Schedule of Fair Value for Financial Assets and Liabilities Measure on Recurring Basis) (Details) (Recurring, USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Jun. 30, 2012
--- | --- | ---
Level 1 |  |
Assets |  |
Total | $ 59,110 | $ 36,141
Level 2 |  |
Assets |  |
Total | 106,422 | 99,098
Level 3 |  |
Assets |  |
Total | 0 | 0
Total |  |
Assets |  |
Total | 165,532 | 135,239
Municipal Bonds | Level 1 |  |
Assets |  |
Investments |  | 0
Municipal Bonds | Level 2 |  |
Assets |  |
Investments |  | 2,736
Municipal Bonds | Level 3 |  |
Assets |  |
Investments |  | 0
Municipal Bonds | Total |  |
Assets |  |
Investments |  | 2,736
Federal Agency Notes | Level 1 |  |
Assets |  |
Investments | 0 | 0
Federal Agency Notes | Level 2 |  |
Assets |  |
Investments | 7,513 | 11,234
Federal Agency Notes | Level 3 |  |
Assets |  |
Investments | 0 | 0
Federal Agency Notes | Total |  |
Assets |  |
Investments | 7,513 | 11,234
Money Market Funds | Level 1 |  |
Assets |  |
Investments | 59,110 | 36,141
Money Market Funds | Level 2 |  |
Assets |  |
Investments | 0 | 0
Money Market Funds | Level 3 |  |
Assets |  |
Investments | 0 | 0
Money Market Funds | Total |  |
Assets |  |
Investments | 59,110 | 36,141
Corporate Notes and Bonds | Level 1 |  |
Assets |  |
Investments | 0 | 0
Corporate Notes and Bonds | Level 2 |  |
Assets |  |
Investments | 98,899 | 84,949
Corporate Notes and Bonds | Level 3 |  |
Assets |  |
Investments | 0 | 0
Corporate Notes and Bonds | Total |  |
Assets |  |
Investments | 98,899 | 84,949
Forward Contracts | Level 1 |  |
Assets |  |
Foreign currency forward contracts |  | 0
Liabilities |  |
Foreign currency forward contracts | 0 |
Forward Contracts | Level 2 |  |
Assets |  |
Foreign currency forward contracts |  | 179
Liabilities |  |
Foreign currency forward contracts | 10 |
Forward Contracts | Level 3 |  |
Assets |  |
Foreign currency forward contracts |  | 0
Liabilities |  |
Foreign currency forward contracts | 0 |
Forward Contracts | Total |  |
Assets |  |
Foreign currency forward contracts |  | 179
Liabilities |  |
Foreign currency forward contracts | $ 10 |

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