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Debt (Senior Notes) (Narrative) (Details) (Senior Notes, USD $)
1 Months Ended 3 Months Ended
Sep. 30, 2012
Oct. 31, 2012
Apr. 30, 2014
Jan. 31, 2014
Debt Instrument [Line Items]        
Debt, face value $ 350,000,000   $ 350,000,000 $ 350,000,000
Debt, stated interest rate in percentage 3.75%   3.75% 3.75%
Proceeds from issuance of long-term debt 345,800,000      
Debt discount 1,300,000   908,000 974,000
Debt issuance costs $ 2,900,000      
Debt Instrument Expiration Year 2017      
Debt redemption price as a percent of principal amount   100.00%    
Treasury Rate
       
Debt Instrument [Line Items]        
Discount rate, basis spread on Treasury Rate 50.00%