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Fair Value of Financial Instruments (Details 5) (USD $)
In Thousands, unless otherwise specified
Mar. 01, 2011
Term loan B-1
Sep. 30, 2012
Level 2
Term loan B-1
Sep. 30, 2012
Level 2
Notes
Fair value measurements      
Face value of debt instrument $ 1,750,000 $ 1,507,500 $ 650,000
Fair value of Notes   $ 1,507,500 $ 726,375