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Summary Of Significant Accounting Policies (Schedule Of Investments In Money Market Funds Table) (Details) (BlackRock Liquidity Temporary Fund - Institutional [Member], Taxable Money Market Funds [Member], USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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BlackRock Liquidity Temporary Fund - Institutional [Member] | Taxable Money Market Funds [Member] |  |
Investment Holdings [Line Items] |  |
Cost | $ 18,276 | $ 58,620
Fair Value | $ 18,276 | $ 58,620

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