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Long-Term Debt (Narrative 2012 Senior Notes) (Details) - 2012 Senior Notes
Jan. 31, 2012
USD ($)
Debt Instrument [Line Items]  
Debt issuance costs capitalized $ 12,600,000
Senior Notes  
Debt Instrument [Line Items]  
Debt instrument, face amount $ 250,000,000.0
Debt instrument, stated interest rate 8.125%