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Long-Term Debt Long Term Debt (Details textual) (USD $)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended
Mar. 31, 2014
Aug. 31, 2011
Three Point Seven Five Percent Senior Unsecured Notes Due September First, Twenty Sixteen [Member]
Apr. 30, 2013
Term loan facility [Member]
Apr. 05, 2013
Term loan facility [Member]
Mar. 31, 2014
Long-term Debt [Member]
Debt Instrument [Line Items]          
Debt instrument, face amount   $ 250   $ 150  
Debt instrument, interest rate, stated percentage   3.75%      
Debt instrument, maturity date   Sep. 01, 2016 Apr. 05, 2019    
Senior unsecured notes, proceeds   247.7      
Senior unsecured notes, term (in years) 5 years        
Debt Instrument, Description of Variable Rate Basis     Interest is accrued at the one-month LIBOR rate plus the scheduled spread    
Debt instrument, frequency of periodic payment   semiannually monthly    
Debt Instrument, Periodic Payment, Principal         $ 3.75
Senior unsecured notes, interest payment dates   March 1 and September 1      
Debt Instrument, Date of First Required Payment     Jun. 30, 2013