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Fair Value Measurements (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Fair Value Measurements (Textual) [Abstract]      
Available-for-sale securities $ 10,000,000 $ 14,000,000 $ 13,000,000
Fair value of long-term borrowings $ 1,300,000,000 $ 1,300,000,000 $ 1,300,000,000