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Transactions with Affiliates (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Transactions with Affiliates (Textual) [Abstract]      
Fees and reimbursements from related parties $ 12.6 $ 9.8 $ 10.6