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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
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