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Certain Relationships And Related Party Transactions (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Certain Relationships And Related Party Transactions [Abstract]        
Management fee, rate per year $ 15.0      
Management fees $ 3.9 $ 3.8 $ 11.9 $ 11.8