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Certain Relationships And Related Party Transactions (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Certain Relationships And Related Party Transactions [Abstract]        
Management fee, rate per year $ 15.0      
Management fees $ 4.0 $ 4.2 $ 8.0 $ 8.0