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FAIR VALUE OF FINANCIAL INSTRUMENTS (Narrative) (Details) (USD $)
Sep. 30, 2013
Jun. 21, 2013
Sep. 30, 2012
Jan. 18, 2012
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-term debt, carrying value $ 1,263,232,000   $ 830,000,000  
Senior Notes [Member] | 6.5% Senior Notes [Member]
       
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-term debt, carrying value 658,232,000   450,000,000  
Principal amount 650,000,000 650,000,000   450,000,000
Long-term debt, fair value $ 662,000,000      
Interest Rate Swap [Member] | Maximum [Member]
       
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Credit valuation adjustment to total fair value percentage (less than 1%) 1.00%