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Noncontrolling Interests (Details Textuals) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2011
Dec. 31, 2010
Noncontrolling Interests (Textuals) [Abstract]  
Percentage of ownership interest in partnership50.10% 
Mandatorily Redeemable Noncontrolling Interests included in other liabilities$ 3.1$ 1.7