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Long-Term Debt (2012 Senior Notes) (Details) (USD $)
Dec. 17, 2013
Jan. 31, 2012
Debt Instrument [Line Items]    
Percentage of subsidiary owned 100.00% 100.00%
2012 Senior Notes
   
Debt Instrument [Line Items]    
Debt issuance costs capitalized   $ 12,600,000
Senior Notes | 2012 Senior Notes
   
Debt Instrument [Line Items]    
Debt instrument, face amount   $ 250,000,000
Debt instrument, stated interest rate   8.125%