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Fair Value Measurement (Details Textual) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Jun. 30, 2011
Fair Value Measurement (Textual) [Abstract]    
Carrying amount of long-term debt $ 2,345,130 $ 834,113
Estimated fair value of long-term debt $ 2,404,863 $ 850,188