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Summary of Significant Accounting Policies (Details) (USD $) In Thousands | Jun. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Assets: |  |
Available-for-Sale Securities | $ 284 | $ 248
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets: |  |
Available-for-Sale Securities | 284 | 248
Significant Other Observable Inputs (Level 2) [Member] |  |
Assets: |  |
Available-for-Sale Securities | 0 | 0
Unobservable Inputs (Level 3)[Member] |  |
Assets: |  |
Available-for-Sale Securities | $ 0 | $ 0

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