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Condensed Consolidating Financial Information (Details) (Textual) (Common Stock Class A Non-voting [Member], USD $)
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Common Stock Class A Non-voting [Member]
     
Stockholders' Equity      
Common Stock, par value $ 0.01 $ 0.01 $ 0.01