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Fair Value of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Fair Value of Financial Instruments (Textual) [Abstract]  
Estimated fair value of Long-term debt (including current maturities) $ 2,304,920
Gross amount of company long term debt 2,208,060
Carrying amount of company long term debt $ 2,189,714